Just got mine. I am not a girl, more of a young lady at 5'1" and 100-ish lbs, and thought I'd try to get away with a kids size. I got a L and it almost seems big on me. I think that has to do with it being a kids jacket and therefor, no real shape i.e. boxy. I will keep it and try it on with a few things before I make a final decision. It is not impossibly big so if you know you'll be wearing a sweater or something bulkier under it most of the time to take up the space in the body of the jacket, definitely order it! Besides shape/sizing, it's very lightweight, has a soft lining, and compresses nicely if space in a coat closet is a concern.