I'm sorry. I meant "the business" as in "the business you're representing", not the "business" as in suits. So in this case dressing in wacky t-shirts and mohawks.

Actually, as you put it, wearing a nice business suit might be a good solution for women at defcon. It would buck the trend of dressing whacky forced-casual, making you stand out and garner attention, and, noone is going to grab the ass of a suspected federal agent.