Do you mean for cloth diapers? Then the answer is probably not, although it sounds like an interesting test. I've seen vinyl bloomers, but never tried one. They do have leg cuffs just farther down. Waterproof pants aren't supposed to be water tight around the legs. Just waterproof enough to not let moisture get through to your clothing. Still it probably won't work because the wetness might seep down your leg. Try it and report back.