We do, on occasion, but it is far from mandatory. He is Dominant 24/7 so He doesn't need to dress up for that – though I am quite partial to a certain pair of leather pants - and as for myself, His preferred dress code is nudity. But playing out fantasies and dressing up can be fun – speaking of which, He has been promising to me to dress up as Thor since forever, good thing you reminded me, now I have to go book His Halloween costume.