I have funky bumz which is a NZ swim nappy - its great made from lycra and microfleece. It has double gusseted legs and I've never had a poo in it.
We also had the fluffies [ants when she was little, and they were great. We found ours at the local op shop for $1!!
One of the pools here wont actually let you use the huggies swim nappies - they insist on reusable which I think is nice.
I have seen a huggies not cope well with a poo.....YUCK!!! Total gross out!
At home in our pool its au naturale - who cares if they poo!