For reference I’m 5 foot 3 inches and weigh about 140 pounds. I normally wear a size small in jeans but I got a size medium and they fit just right. If you’re going for a looser fit definitely size up. I love these jeans though, for a shorter girl like me they reach my ankle so it’s not very tall girl friendly. The back is exactly like the picture but they don’t come tied up already you have to do it. Overall these jeans and perfect and I recommend!