Why Sizing Feels Different
Chinese clothing sizing follows different standards than Western markets. A large t-shirt from a Chinese seller may fit like a medium from a US brand. The first rule is to ignore the label size and focus on the numeric measurements. Most listings include a size chart with chest width, shoulder width, length, and sleeve length in centimeters.
The reason for the discrepancy is that Chinese sizing is optimized for East Asian body proportions, which tend to have narrower shoulders and shorter sleeves relative to chest circumference. When you shop through OSSBuy, you are buying directly from these supply chains, so understanding the numbers is essential to a good fit.
Measurement Reference
Measure chest at nipple level
Shoulder: edge to edge across upper back
Length: highest shoulder point to desired hem
Sleeve: shoulder seam to wrist bone
How to Measure Yourself Correctly
Use a soft measuring tape and measure over the undergarments you plan to wear. For chest, wrap the tape around the widest part of your torso at nipple level. For shoulder width, measure from the edge of one shoulder bone to the other across your upper back. Length is measured from the highest point of your shoulder down to where you want the hem to fall. Sleeve length runs from the shoulder seam to your wrist bone.
Record these four numbers in centimeters. When you browse the OSSBuy Spreadsheet, compare your numbers to the size chart in each product row. If your chest is one hundred and four centimeters and the large size lists one hundred and six, that gives you two centimeters of ease, which is comfortable for a relaxed fit.
Measurement Reference
Measure chest at nipple level
Shoulder: edge to edge across upper back
Length: highest shoulder point to desired hem
Sleeve: shoulder seam to wrist bone
Common Pitfalls and How to Avoid Them
The biggest mistake is assuming your usual size. A second common error is measuring over thick clothing, which adds bulk and leads to oversized orders. Third, some sellers post flat-lay measurements rather than body measurements. Flat-lay chest width is half of the total circumference, so double it before comparing.
When in doubt, size up. Alterations are cheaper than returns, and oversized streetwear is on trend. Our spreadsheet notes which sellers provide accurate charts and which ones tend to run small, so pay attention to the community rating column before you buy.