I accidentally bought these in both a 9 and an 11 I usually wear an 11 in pants. There is a gap in the crotch area with the 11 however with the size 9 they're not long enough they're slightly high water so I suggest getting the size you usually wear and pulling them up as high as you can and putting on a belt or if you want to roll them up and wear them as high waters so that they can fit tighter in the crotch area Then you can go down a size from your normal size. Im 5'6 160 lbs with a nice slim curvy body frame for reference

These pants are not big booty friendly. There is absolutely no stretch.