I hesitated buying a bathing suit online because I hate to return things. My waist size is 34 going on 35. I did not want to order a large because I keep telling myself I will get back to a solid 34. I liked that the medium said 34/35. I really like the elastic band that goes around the whole waist because it gives if needed. Does not feel to tight and will certainly not fall off. I liked this bathing suit so much that I'm going to order another one in a different color.