This is a gorgeous high quality blouse. the color is stunning in person; i don't have anything like this color in my wardrobe. i'm an xl in retailer tops, and purchased this blouse in a 16. i am busty but the top still fit well. i have large upper arms but the sleeves fit fine; i wish they were a bit looser but that is my personal preference and probably doesn't apply to most people. if you're very thin and not busty you might be able to size down, but i'm honestly just not sure. i'm happy to say