SIZE GUIDES / Clothing
Men’s Loungewear & Onesie Size Chart
Match loungewear tops by chest and onesies by chest plus waist. Compare XXXS–XXXL body ranges.
Updated: · No sign-up required
Find a country or size system
Choose a country to jump to its size chart. Use the chart for the brand you plan to buy; unavailable systems cannot be converted here.
Use the ASOS letter sizes and body measurements here. For Russian, Japanese or Korean brands, check their own measurements; the same letter may fit differently.
Loungewear tops
Don’t know your size? Use measurements
Enter your body measurements. If several ranges overlap, the first match is shown; between two listed measurements, the larger size is shown. Check the product’s fit before buying. ASOS · own-brand reference
Choose a size to highlight matches, or select a row below.
Scroll sideways for the full chart
| ASOS size | Chest range (in) | Chest (cm) |
|---|---|---|
| 30–32 | 76–81 | |
| 32–34 | 81–86 | |
| 34–36 | 86–91 | |
| 36–38 | 91–96 | |
| 38–40 | 96–101 | |
| 40–42 | 101–106 | |
| 42–44 | 106–111 | |
| 44–46 | 111–116 | |
| 46–48 | 116–121 |
For ASOS own-brand clothing. Check the product’s cut and choose centimetres or inches to compare your measurements.
Brand size guide: ASOS · own-brand reference
Onesies
Don’t know your size? Use measurements
Enter your body measurements. If several ranges overlap, the first match is shown; between two listed measurements, the larger size is shown. Check the product’s fit before buying. ASOS · own-brand reference
Choose a size to highlight matches, or select a row below.
Scroll sideways for the full chart
| ASOS size | Waist range (in) | Waist (cm) | Chest (cm) |
|---|---|---|---|
| 24–26 | 61–66 | 76–81 | |
| 26–28 | 66–71 | 81–86 | |
| 28–30 | 71–76 | 86–91 | |
| 30–32 | 76–81 | 91–96 | |
| 32–34 | 81–86 | 96–101 | |
| 34–36 | 86–91 | 101–106 | |
| 36–38 | 91–96 | 106–111 | |
| 38–40 | 96–101 | 111–116 | |
| 40–42 | 101–106 | 116–121 |
For ASOS own-brand clothing. Check the product’s cut and choose centimetres or inches to compare your measurements.
Brand size guide: ASOS · own-brand reference
Loungewear sets and onesies need more than one measurement
The top table uses chest ranges; the onesie table combines chest and waist. If these measurements point to different letters, the finder shows both references before using the larger row. This reveals a possible loose area, but it does not check torso length or how the garment moves when you sit.
For a matching sleepwear set, verify whether the top and bottom can be selected separately. For a onesie, look for shoulder-to-crotch or total-length information in the product details. A comfortable chest does not prevent a short torso from pulling at the shoulders, so keep length checks separate from the converter.
See how a size converts
In Loungewear tops choose ASOS size M. The listed equivalents are:
- ASOS size M
- Chest range (in) 38–40
Brand size guide: ASOS · own-brand reference
Open this example in the converter →Three checks before ordering
- Match the product brand, country system and garment type to the selected table.
- Keep body and garment measurements separate, with consistent centimetre or inch units.
- Check the specific style’s length, width and stretch, then read the store’s sizing and exchange information.
START WITH MEASUREMENTS
How to measure
- 01
Measure around your chest at its fullest point with relaxed arms.
- 02
Stand naturally and measure around your waist with a level tape.
- 03
For a onesie, also check torso length on the product page before ordering.
A few things labels don’t tell you.
These are body ranges, not flat garment widths. Torso length and desired room matter for sleepwear and onesies.
Common questions
Can I pick a onesie by chest alone?
Check waist as well, and use the product’s length details for the torso.
Does the chart include extra room?
Compare actual body measurements first; use the product’s fit description to judge room.
Can I convert men’s loungewear to Russia, Japan, Korea or S-M-L?
Use the ASOS letter sizes and body measurements here. For Russian, Japanese or Korean brands, check their own measurements; the same letter may fit differently.