lurkette had a set of red satin sheets in college. I always felt like I was a sandwich with too much mayo--always slipping out the other side. Worse, they were Queen size sheets on a Twin bed... Still, we felt sexy in them.
We have a set of sheets now that is made of modal, which is a fabric made from beechtree fiber, and it's WAY softer than any cotton sheet I've ever come across. You lay on it and you just have to squirm around some, they're so soft. Bed Bath and Beyond has them for reasonably cheap here:
http://www.bedbathandbeyond.com/prod...=-1&sku=104324