I know sizing for clothing from China can be a bit off, but I didn't know it could be *this* off.  I ordered an XXL (which was marked at XXL/XXXL!), and the sizing is really identical to a US L.  This is unfortunate, because it's a really cool-looking hoodie, and it's made out of a stretchy, almost spandex-type material.  On the upshot, it kind of fits my 14 year old daughter ("slouchy chic", she said).