I’m 5’5, 160lbs and I ordered a large.
I’m not sure if it’s just me or if it’s the Born Primitive brand but either I’m not careful enough with my clothes or the material is easily damaged. I’ve worn these & washed these once and there’s already a little damage to the fabric, not sure if it happened while I was wearing or in the wash. Anyways, I do love them while I was wearing them for a workout. The material is thinner and more adjustable than other booty/biker shorts I have, which feels really nice. And though they feel thinner/lighter, they aren’t see-through or anything.