Is there something specific you need to do to get the "no" gear in the water temple? I've only gotten the trousers and shoes but the top and hat don't appear at all.
They can all be found in the chests on the third floor. Each room gives you one specific piece, so just savescum in front of each chest. There is no head piece, but there is a hand piece you're also missing. For more info, you can check the walkthrough