You if you really want something nice to where for those special nights. You could always try Fredericks of H. I know a lot of their stuff is a little off the wall, but they do have some nice, not to wild outfits. A friend of mine picked something up there for her wedding night and she's a size 24, I think. I was surprised how cute/sexy it really was without being, well you know.

But I know what you mean about larger sizes. It seem like they get the material off someone's couch or drapes. Just because someone is large doesn't mean they want to look like they just riped the drapes off the wall and wraped that around them.