Okay, I'm going to ask the obvious question... what kind of underwear is elastic-free?
My hives are also worse anywhere my skin is rubbed, so yeah, bra strap etc. I got some on the palm of my hand, on my scalp, and I'm pretty sure inside my ears, because they feel really weird.
I've given up all pretense of self control and am scratching like crazy. There is nothing better than that milisecond of relief that comes from a good hard scratch.