Please consider wearing a slip! I sat behind a woman in church last week, every time we got up to sing she had to (not very) discreetly dig a out "wedgie" - and she was a very slim person, too. I've seen it worse in larger people.
Later in the parking lot it was breezy and several women might as well have not been wearing a skirt at all since we could all see every part of their anatomy from waist to ankle where the fabric blew through their legs.
Yuck. Even though you still have to deal with static cling, it's slips for me with each and every dress! Makes them hang so much better.