I am 5‘9 and 138lbs. I usually wear size m, but i chose size s based on the reviews. The pants fit perfectly and i love this set. It looks really cute. With tops i'm always with S or M, so that doesn't matter, because the top would have fit anyway. But i have to say that i can't imagine that these pants at xs are much smaller. Therefore, the pants are not for skinny or small girls even at xs. The pants would be too big. The top would fit, you could combine it with another pair of pants. But the money only for a top..