Customer 1: 5'3, 165lbs, choose X-Large was perfect. Customer 2: 5'4, 125lbs, hips are 37.5 inches, got a Small, worked just fine.
Customer 3: 5'4, 140lbs, ordered a size Large and it fits perfectly. Customer 4: 5'8, 130lbs, got a Medium, it fits perfectly!