I wore a pair of regular pantyhose every day of my pregnancies for professional reasons. I simply purchased a size bigger than I normally would to accommodate my growing belly, and it worked beautifully.
I'm not much of a fan of skirts anyhow.....I think I only had 1 skirt that I wore during both pregnancies in preference of yoga pants, elastic waist band pants and a few pairs of maternity pants (that I hated).
Even if you're a little overweight, you should be able to find plenty of things that will help you feel comfortable and not be expensive.
Good luck!