BM dress help

This is probably the ba-zillionth time this has been asked but i'll just add one more.

So looks like i'm going shopping with my sister on Thursday eve. I need to figure out where to go that will actually have plus size dresses to try on. I've had a lot of problems with this in the past. So far the only place we know of is TWC (though we will NOT be buying there).

Any other ideas?

No one seems to be answering any of my posts lately.