Haha. That's a good question!
I also think they use sligs for it (poor guys). But I wonder what glukkons did when they didn't meet the sligs yet... running around nacked?
Maybe the glukkons have got clothes you can close from the inside.... like a zipper on backwards. They actually do have arms and hands, I think, even they stand on them all the time. One of their hands they could use to dress themself (and the other hand to stand on the ground).
(Lol, that's a great one
)