well, XtraX does a lot of nice plus size stuff in both men's and women's. If you click on each selection to the right, you go to a page where you can choose "dresses", "skirts", "coats", etc. If you choose "Angels & Devils XXL", it will show you everything in that range that is plus size. I belive most stuff goes up to waist size 44"
If you're female,
www.persephoneplus.com.
Also:
http://www.batgearbeyond.com/links.asp?ID=GothicP