I'm a size 12 and got the large black - it fits really nicely and is pretty comfortable and loose, except the arms. They are comfortable if you're not wearing a long sleeve - or only wearing a thin long sleeve. I could get away with a thin cardigan but like the other reviewers noted the arms fit snug. I got this jacket when it dropped in price and it was a total steal. It's very chic and I feel awesome wearing it!