I ordered the 2x size. I am a size US 22-24 in pants or US 2x in yoga pants. I needed some kind of shorts or slip to use under dresses and skirts without feeling sweat dripping down my legs along side the chub rub. The 2x size would possibly be able to accommodate a larger size than 24  in pants or 3x-4x in yoga pant. They are see through and aren't meant to be worn alone. I don't think id be able to wear these with mid thigh dresses due to length of slip. I wore them at a party and they didn't roll down or up. I could've gotten away with ordering 1x but happy with the 2x.