Innerwear is the category where Korean and US sizing diverge most, because the underlying band and cup conventions are different. It is also a category where returns are effectively impossible, so getting the conversion right before you order is the entire task.
Bra sizing conversion
Korean bras use band size in centimeters, typically 65 through 85, with cup letters that do not map one-to-one onto US cups. A Korean 75B is roughly a US 34A to 34B depending on brand. Korean cup volumes generally run smaller for the same letter, so sizing up a cup is common advice for US buyers.
What Korea does well in this category
Seamless and wireless bras, thin heat-retaining base layers, and loungewear sets. The base layers in particular are excellent value at 15,000-35,000 KRW and are noticeably thinner than US thermal underwear while performing similarly.
Loungewear and pajama sets
Korean pajama sets at 30,000-70,000 KRW are cut generously and sized S through L or free size. They are among the safest remote purchases in the whole clothing category because fit tolerance is high. Cotton sets weigh 400-600 g.
Hygiene and returns
Innerwear is non-returnable in Korea once the seal is broken, which mirrors US practice. Buy a single piece to check the fit before ordering multiples, and use the flat measurement table rather than the size letter.
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Start a buy-for-me order →Frequently asked
Should I size up in Korean bras?
Most US buyers find one cup size up gives a closer fit. Compare the underbust measurement in centimeters as the starting point.
Are Korean base layers warm enough for a US winter?
They are thin and designed for layering. For deep cold they work under other layers rather than on their own.
Is loungewear sized generously?
Generally yes. It is one of the few Korean apparel categories where free size genuinely accommodates a wide range.