Rachel just make sure that you get the heating turned up high with that underwear. My gran warned me that wearing frivolous undies (and they were gargantuan still in comparison to what you're talking about!!) was a sure fire way to catch your death so god alone knows what you will be exposed to.
Second thoughts cancel that, I know what ladies wearing that kind of undies will be likely to get uo to (I was young once you know)
Whatever just make sure you enjoy it.
M