I haven't done the nude dive, yet. Back in NZ I was working in a dive shop for a bit and I was getting close to my 100th dive (at about 80 at the mo) and they always said that my 100th would have to be in the nude. I was a bit disappointed i had to wait that long, lol.
Around there tho the water can be way too cold for it so I don't know if I would have actually done it. Maybe for less than 20min in abut 5 meters of water but other than that you could get yourself into trouble. We had one girl who was doing her 100th dive but we were diving in 10dec C water at 40 meters and we were all wearing dry suits or 7mm two piece wetsuits so she gave it a miss.