first purchased size XL and works great with a hoodie underneath, very very warm & cozy. then purchased size LG to wear as an outer layer, but that is nearly skin tight (and a bit too cropped). I have dozens of Adidas tops (zip-ups, hoodies, sweaters, etc) and normally don’t have this issue. nice piece, I kept both sizes, but kinda strange the size-grading is that drastic between sizes.