What is the US/European equivalent of a Japanese size S (pnish T-shirt)?

Question

I realize different stores/brands use different sizes, however I am talking about standardized tour t-shirt sizing. I'm just wondering if anyone knew. If it helps, i'm talking about the t-shirt on the bottom most right here http://pnish.jp/goods/index.html#kanbai (the one that comes in black/pink/white, has we are pnish on the back and is sold out). If someone could tell me the size or even the approximate measurements, I would be most grateful.

Answer 1

Usually japanese and Asian Sizes are smaller than American Size...AMericans are just bigger on average....this applies to Euro sizes as well..

If its a Small in Japan, then its gonna fit like an XS in America. My suggestion is to get it bigger, as you can always easily shrink it ( I am assuming its a cotton t-shirt) in the wash. Better safe than sorry