No vanity sizing here...I'm four feet 11, 105 lbs, and the x small fit me perfectly in the waist, rear, and leg. These are beautiful pants, but sadly, are four to six inches too long on me- and I learned once the hard way that tailoring ski pants is ridiculously pricey. If you're five three to five five, and slim- you'll rock these pants.Just received them and will wear this weekend skiing. They are very fitted and show off your backside. I’m 5’3” and weigh 128. I usually wear a size 2 or 4. I ordered a small and had to return for a medium. The smalls are for tiny size 2’s or size 0’s. They are a little stiff but most ski pants are. I’m optimistic they will be comfortable to ski inif you're looking for pants that fitted in the butt, these are definitely them. ended up returning them though because they're described as artic white, and were way more gray than they were white.Ordered normal size and it was way too small- order 1-2 sizes up.Love them, super warm.i LOVE these pants they have the perfect amount of stretch and they’re so cute. I got a large and I’m about 5’3 155 pounds. The onlyReason I gave it 4 stars is because there are no pockets which makes having your phone or anything else on you kind of annoying