"Ben, you know how Mike is about clothes.  He just doesn't understand them.  Or didn't.  I had to teach him everything.  He couldn't see any point to them as protection, until he grokked - to his great surprise - that we aren't as invulnerable as he is.  Modesty - that sort of 'modesty'; he's so modest in its true sense that it hurts - body-modesty isn't a Martian concept, it couldn't be.  And only lately has Mike grokked clothes as ornaments, after we started experimenting with various ways to costume our acts.