>>6176119I'm not sure about 1/6 clothes, but I've got mine in a Ken doll suit I had from a leftover custom. It's a bit tight in the ass since his butt is non-human in detail, and the shoulders are kinda odd, but it's a decent fit. You can get a good feel of the fit in the pic (ignore my messy desk.)
I really want to get him a proper suit though, just not ready to blow 50-70 bucks on something that might not work.