Vizeau sells some of the most amazing underwear (and swimwear) for men I've ever seen. While the site is a bit of a sensory overload (turn down your speakers, seriously), the designs range from the brilliant to the outrageous. And, as you see from the pic, there's a "secret" undie section with some rather racy undergarments that I don't think are designed to be worn under a tuxedo. That is, unless the tux is designed to be ripped off the body quickly. The secret section is not safe for work, so be careful. Now I need to get to the gym so I can wear the less racy stuff!