The Onyx Romper | Zip Up
Smith D.
Love the color vibrancy, fun, great material, receives so many compliments. I’m 6’ 3”, 205 lbs, and I went with a Large. Fits great!
Vinz L.
It’s my first rompers and i love it. I thought it wont look good on me but all my friends loved it when they saw me wearing :)
Michael M.
They are a great color and fit really well! Love them!!
All-Occasion Ready
Smart Details
Tailored Slim Fit
Butter-Soft Fabric
The Onyx Romper: Your New Go-To Style
Butter Soft Cotton Poly Blend Material | Zip Up Romper
Comfort Meets Style
The Onyx Romper is designed with the modern man in mind, combining comfort and style effortlessly. Made from soft, breathable fabric, this romper feels great against the skin, making it perfect for all-day wear. Whether you're out running errands or lounging at home, the onyx romper provides the comfort you need without sacrificing your fashion sense.
Versatile Fashion Choice
What sets the onyx romper apart is its versatility. It features a zip-up front that not only adds a trendy touch but also allows for easy wear and removal. You can dress it up with a smart jacket for a night out or keep it casual with sneakers for a day in the park. Because of its adaptable style, this romper is suitable for various occasions, making it a staple in any wardrobe.
Easy Care and Maintenance
Caring for your onyx romper is simple and convenient. The fabric is machine washable, ensuring that you can maintain its quality and vibrant color without a hassle. So, you can keep your favorite outfit fresh and ready for any adventure that comes your way. Investing in this romper means you're choosing practicality and style together, a decision that will pay off in your everyday life.
Size & Fit Guide
Find your fit. Own your look. Our rompers and jumpsuits are designed for a modern, tailored silhouette—and the right size makes all the difference.
Use this guide to learn how each style fits, take your measurements, compare our size charts, and get a personalized recommendation with WAIR.
How RomperJack Fits
Rompers
RomperJack rompers have a slim, fitted silhouette through the chest, waist, and shorts. They're designed to look sharp rather than loose or oversized.
If you're between sizes, have broader shoulders or thighs, or simply prefer a little extra room, consider the larger size.
Jumpsuits
Our jumpsuits feature a European-inspired slim fit, with a streamlined upper body and tapered leg. They're cut for a tailored, modern look.
Because they're full-length, pay particular attention to the torso and rise. You should be able to sit, reach, and bend comfortably without pulling through the shoulders or crotch.
How to Measure Your Body
Use a flexible tape measure over lightweight clothing or against your skin. Keep it level and comfortably snug, not tight. Having someone help can improve accuracy.
Chest
Wrap the tape under your arms and around the fullest part of your chest.
Waist
Measure around your natural waist, generally above your belly button. Don't hold your stomach in.
Hips & Seat
Measure around the fullest part of your hips and seat so you have room to sit and move.
Height
Stand straight without shoes and measure from the floor to the top of your head.
Inseam
Measure from the crotch along the inside of your leg to your desired pant hem. Especially useful for jumpsuits.
Torso Length
Check how much length you need between your shoulder and crotch. Longer torsos often need extra room in a one-piece style.
Compare chest and waist measurements with the charts below. Height, weight, and length provide extra context; they should not replace a comfortable fit through your torso.
Romper Size Chart
Designed with a slim, fitted cut. Compare your chest and waist first, then use the height and weight ranges as additional guidance.
Romper Sizing
Best used for RomperJack-branded rompers only. All body measurements are shown in inches; weight is shown in pounds.
| Size | Chest | Waist | Height | Weight (lbs) |
|---|---|---|---|---|
| S | 34–38" | 26–28" | 64–68" | 140–155 |
| M | 38–40" | 28–30" | 65–70" | 155–170 |
| L | 40–42" | 30–32" | 65–73" | 170–190 |
| XL | 42–44" | 32–34" | 68–74" | 190–210 |
| XXL | 44–46" | 34–36" | 74–77" | 190–210 |
| XXXL | 46–48" | 36–38" | 70–77" | 230+ |
See the fit in action
Our rompers are designed for a close, tailored fit through the chest and waist, with room to move comfortably through the shorts. Use the model photo to see how the silhouette sits on the body.
Size reference: At 6'0" and 190 lbs, Large can be a useful starting point, depending on your chest, waist, and torso measurements. Individual fit may vary.
Jumpsuit Size Chart
Our jumpsuits are slim-fitting with a tapered cut. Consider chest, waist, and overall torso comfort when selecting your size.
Jumpsuit Sizing
Best used for RomperJack-branded jumpsuits only. Measurements are shown in inches.
| Size | Chest | Waist | Length |
|---|---|---|---|
| S | 35–37" | 26–28" | 28" |
| M | 37–39" | 28–30" | 30" |
| L | 39–42" | 30–33" | 31" |
| XL | 42–44" | 33–35" | 33" |
| XXL | 44–46" | 35–38" | 34" |
| XXXL | 46–50" | 38–40" | 44" |
6'0" · 190 lbs · Size Large
The model is 6 feet tall, weighs 190 lbs, and wears a Large. This shows how our slim, tapered jumpsuit is designed to sit through the shoulders, waist, and legs.
For your best fit, compare your chest and waist measurements, and consider your torso length before selecting a size.
Need a Second Opinion? Try WAIR.
Not sure which size to choose? The interactive WAIR sizing tool can help you find a recommended size for participating RomperJack rompers and jumpsuits, based on information about your body and fit preferences.
Open the romper or jumpsuit you're shopping for, look for the WAIR sizing option near the size selector, and follow the prompts. WAIR is accessed on participating product pages—not directly from this guide.
WAIR is a helpful recommendation tool. Review the product description and fit details before making your selection.
About RJ Picks & Partner Sizing
This size guide applies only to RomperJack-branded rompers and jumpsuits.
Styles in RJ Picks are curated from partner brands and may follow different size standards. For shirts, pants, shorts, jackets, shoes, accessories, two-piece sets, and other partner products, refer to the individual product page or the partner brand's website for accurate sizing information.
Do not assume that the RomperJack charts or WAIR recommendations apply to RJ Picks products.
Size & Fit FAQs
Do RomperJack rompers and jumpsuits run small?
They're designed with a slim, tailored silhouette, not a relaxed or oversized fit. If you're between sizes or prefer extra room, consider sizing up.
What's most important when sizing a one-piece?
Chest and waist are your starting points, but torso length and the room you need to sit or bend comfortably are also important.
Can I use these charts for RJ Picks items?
No. RJ Picks partner products may use different sizing. Use the size information on that product's page or on the partner brand's website.
Currently, store credit is only available for returns and exchanges. Once your return or exchange has been processed, you will receive an email containing a RomperJack E-Gift card code for the amount of the item returned, not including any initial shipping charges. Please submit a return here. Read our return policy here.
We offer standard 3- to 7-business-day shipping and 2- to 5-business-day priority shipping for Domestic orders. Some items may be on preorder, which is stated on the product page. This may take longer to ship. International shipping can take anywhere between 7 and 21 business days.
If you order a preorder item and an in stock item, your full order will ship only when the preorder inventory is available at our warehouse. If you need the in stock item before the preorder, please make a separate purchase. For preorder shipping dates, please check the product description section. Some gift cards and promotions may not be available for preorders.
The Onyx Romper: Your New Go-To Style
Butter Soft Cotton Poly Blend Material | Zip Up Romper
Comfort Meets Style
The Onyx Romper is designed with the modern man in mind, combining comfort and style effortlessly. Made from soft, breathable fabric, this romper feels great against the skin, making it perfect for all-day wear. Whether you're out running errands or lounging at home, the onyx romper provides the comfort you need without sacrificing your fashion sense.
Versatile Fashion Choice
What sets the onyx romper apart is its versatility. It features a zip-up front that not only adds a trendy touch but also allows for easy wear and removal. You can dress it up with a smart jacket for a night out or keep it casual with sneakers for a day in the park. Because of its adaptable style, this romper is suitable for various occasions, making it a staple in any wardrobe.
Easy Care and Maintenance
Caring for your onyx romper is simple and convenient. The fabric is machine washable, ensuring that you can maintain its quality and vibrant color without a hassle. So, you can keep your favorite outfit fresh and ready for any adventure that comes your way. Investing in this romper means you're choosing practicality and style together, a decision that will pay off in your everyday life.
Size & Fit Guide
Find your fit. Own your look. Our rompers and jumpsuits are designed for a modern, tailored silhouette—and the right size makes all the difference.
Use this guide to learn how each style fits, take your measurements, compare our size charts, and get a personalized recommendation with WAIR.
How RomperJack Fits
Rompers
RomperJack rompers have a slim, fitted silhouette through the chest, waist, and shorts. They're designed to look sharp rather than loose or oversized.
If you're between sizes, have broader shoulders or thighs, or simply prefer a little extra room, consider the larger size.
Jumpsuits
Our jumpsuits feature a European-inspired slim fit, with a streamlined upper body and tapered leg. They're cut for a tailored, modern look.
Because they're full-length, pay particular attention to the torso and rise. You should be able to sit, reach, and bend comfortably without pulling through the shoulders or crotch.
How to Measure Your Body
Use a flexible tape measure over lightweight clothing or against your skin. Keep it level and comfortably snug, not tight. Having someone help can improve accuracy.
Chest
Wrap the tape under your arms and around the fullest part of your chest.
Waist
Measure around your natural waist, generally above your belly button. Don't hold your stomach in.
Hips & Seat
Measure around the fullest part of your hips and seat so you have room to sit and move.
Height
Stand straight without shoes and measure from the floor to the top of your head.
Inseam
Measure from the crotch along the inside of your leg to your desired pant hem. Especially useful for jumpsuits.
Torso Length
Check how much length you need between your shoulder and crotch. Longer torsos often need extra room in a one-piece style.
Compare chest and waist measurements with the charts below. Height, weight, and length provide extra context; they should not replace a comfortable fit through your torso.
Romper Size Chart
Designed with a slim, fitted cut. Compare your chest and waist first, then use the height and weight ranges as additional guidance.
Romper Sizing
Best used for RomperJack-branded rompers only. All body measurements are shown in inches; weight is shown in pounds.
| Size | Chest | Waist | Height | Weight (lbs) |
|---|---|---|---|---|
| S | 34–38" | 26–28" | 64–68" | 140–155 |
| M | 38–40" | 28–30" | 65–70" | 155–170 |
| L | 40–42" | 30–32" | 65–73" | 170–190 |
| XL | 42–44" | 32–34" | 68–74" | 190–210 |
| XXL | 44–46" | 34–36" | 74–77" | 190–210 |
| XXXL | 46–48" | 36–38" | 70–77" | 230+ |
See the fit in action
Our rompers are designed for a close, tailored fit through the chest and waist, with room to move comfortably through the shorts. Use the model photo to see how the silhouette sits on the body.
Size reference: At 6'0" and 190 lbs, Large can be a useful starting point, depending on your chest, waist, and torso measurements. Individual fit may vary.
Jumpsuit Size Chart
Our jumpsuits are slim-fitting with a tapered cut. Consider chest, waist, and overall torso comfort when selecting your size.
Jumpsuit Sizing
Best used for RomperJack-branded jumpsuits only. Measurements are shown in inches.
| Size | Chest | Waist | Length |
|---|---|---|---|
| S | 35–37" | 26–28" | 28" |
| M | 37–39" | 28–30" | 30" |
| L | 39–42" | 30–33" | 31" |
| XL | 42–44" | 33–35" | 33" |
| XXL | 44–46" | 35–38" | 34" |
| XXXL | 46–50" | 38–40" | 44" |
6'0" · 190 lbs · Size Large
The model is 6 feet tall, weighs 190 lbs, and wears a Large. This shows how our slim, tapered jumpsuit is designed to sit through the shoulders, waist, and legs.
For your best fit, compare your chest and waist measurements, and consider your torso length before selecting a size.
Need a Second Opinion? Try WAIR.
Not sure which size to choose? The interactive WAIR sizing tool can help you find a recommended size for participating RomperJack rompers and jumpsuits, based on information about your body and fit preferences.
Open the romper or jumpsuit you're shopping for, look for the WAIR sizing option near the size selector, and follow the prompts. WAIR is accessed on participating product pages—not directly from this guide.
WAIR is a helpful recommendation tool. Review the product description and fit details before making your selection.
About RJ Picks & Partner Sizing
This size guide applies only to RomperJack-branded rompers and jumpsuits.
Styles in RJ Picks are curated from partner brands and may follow different size standards. For shirts, pants, shorts, jackets, shoes, accessories, two-piece sets, and other partner products, refer to the individual product page or the partner brand's website for accurate sizing information.
Do not assume that the RomperJack charts or WAIR recommendations apply to RJ Picks products.
Size & Fit FAQs
Do RomperJack rompers and jumpsuits run small?
They're designed with a slim, tailored silhouette, not a relaxed or oversized fit. If you're between sizes or prefer extra room, consider sizing up.
What's most important when sizing a one-piece?
Chest and waist are your starting points, but torso length and the room you need to sit or bend comfortably are also important.
Can I use these charts for RJ Picks items?
No. RJ Picks partner products may use different sizing. Use the size information on that product's page or on the partner brand's website.
Currently, store credit is only available for returns and exchanges. Once your return or exchange has been processed, you will receive an email containing a RomperJack E-Gift card code for the amount of the item returned, not including any initial shipping charges. Please submit a return here. Read our return policy here.
We offer standard 3- to 7-business-day shipping and 2- to 5-business-day priority shipping for Domestic orders. Some items may be on preorder, which is stated on the product page. This may take longer to ship. International shipping can take anywhere between 7 and 21 business days.
If you order a preorder item and an in stock item, your full order will ship only when the preorder inventory is available at our warehouse. If you need the in stock item before the preorder, please make a separate purchase. For preorder shipping dates, please check the product description section. Some gift cards and promotions may not be available for preorders.