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UNIQLO Japan size is one size smaller than USA and Europe size.
For example, Japanese size M is equal to USA/Europe size S and Japanese size L is equal to USA/Europe size M.
You can check the sizes from the following UNIQLO store URL.
<https://www.uniqlo.com/us/en/products/E473378-000/00/size?sizeDisplayCode=001&measurementUnit=inch>