Imse Vimse swim nappies here. Cost about $22 or so when I bought them, fit well, never had a situation to be able to tell you if they worked or not, but they seems to fit well and there were no gapes etc.
Easy on and off.
They stood up well (she only ever needed the small size, the fit til she was 2) and I will use them (bought 2) with this one as well.

HTH