I have a suggestion, before you need stray from your principles:
If it's at all possible, have someone witness you do these twirls in private [with/without underwear depending on who that someone is].
I've found that even in very aggressive dancing sitchyations, modesty is conserved with a decent kilt.

The only problem is the ridiculously fast spin/jump, which is likely to put you on your **** anyway. Or... maybe if you were a shumka dancer, or something.

Underwear makes you a little warmer when dancing, but a lot more when dancing in a situation where you *have* to wear it.


Maybe it's just me, though. I won't dance in pants.