I purchased size small for me and i'm tiny, the small was perfect
I can't possibly convey to you the awesomeness of this hoodie with words. The hoodie itself is a nice quality, thicker, sweatshirt material. It is not so heavy that it's too warm (even here in Alaska) but it is warm enough on milder days to wear over a t-shirt
and go without a coat or jacket. The details (shoulder areas, etc) are thicker (doubled up material) with nice stiffness and body. Everyone who sees this hoodie for the first time comments how awesome it is .. random people stop us in public to inquire where we purchased it .. for sure attention grabbing, stunning hoodie!