We bought some online for Olivia and Charlie...the brand is BubbleBubs or similar....Google will show you...they from memory they were about $20 and effective poo catchers, but.v.lightweight so as not to drag them down. Our local pool is fine with them....although they wear them under an all on one swimmer/rashy, so they wouldn't ever know if it was a Huggies or a cloth.........

(That said, we have a pool at home too, for summer use only, and we just don't bother....neither of them have ever pooed in the pool!)