Do pardon my lack of an original title.

Broadly speaking, this topic can also cover other sensitive/chronic skin conditions. To those out there who have urticaria, hives, ezcema or any other long-term skin complaint, what materials do you find aggravate or lessen it? I know that for me at least, full-body latex or PVC is out of the question as it doesn't let my skin breathe. Silk is fine, and of course, so is nothing. Collars are fine as it isn't on my neck.