I bought this jean jacket for my son's wife for Christmas.  She normally wears a size medium in t-shirts, etc. and based on the other reviews, I ordered one size up, a large.  It fits like a glove, and it looks really cute, especially worn with a dress. I think the cropped length is what makes it so cute.  I wish I was either smaller or the jacket came in a larger size, because I would like to have one too.  Lol!