I guess I'd give the same advice to the men that we always give the women: bring options! You may feel more daring while you're there than you ever imagined...or, you could find yourself the only guy standing around in a ball gag and want to tone it down a bit. Borrow the accessories trick from the girls--you can always add a dog collar, studs, whip, etc. to black T-shirt for BDSM night, glow sticks to your white shirt for white/glow night, etc.