A wetsuit when on dry land.    Not a problem when in the water as it is easy to just pee.  However, if you feel the need to pee when on dry land then it is more of a problem as you pretty much have to take it completely off to get at the necessary parts.  They are not the easiest of things to take off and replace either - especially when wet.   When I first started kayaking and wore wetsuits, I found it a bit of an issue because the intention in a kayak is that you ideally stay in the kayak