I have been buying Splash children incontinence swim nappies for year. Now my son is an adult and his hips are much wider and deeper. So I bought two sizes of Jammers - Adult XS and Adult S. The Adult XS is still slightly too big for him, especially around the waist. He is very skinny and tall. What I like about Splash brand is they have deeper crotch than other brand, which is very important for the containment in the water. I bought so many brands to try, and disappointed so many times. The Splash Jammers so far is the best among all my tried brands. It is easy to put on, has deep crotch. However the material for edges of Splash is not very tight elastic material, and it gets loose pretty quickly. I am wondering if extra plastic band in the edges could solve the problem.
I saw a brand from UK designed a zipper at the diagonal of one side of the front, made with neoprene material, but couldn't find where to buy it. I imagine that design makes the swim diaper fit snugly yet easy to put on. I went extra miles in searching swim nappies for my son, even looked to customly make it. But no tailor I know does it. I hope someone read my feedback and make something fit people like son.