Plus Size Sample Dresses In Stores In D.C.

I was wondering if anyone knows of a bridal store in the D.C. Area (other than David`s Bridal) that carries plus size samples of wedding gowns. I really want to try on some dresses and am finding it very hard to find a store that carries above a size 8 or 10. I am a size 22 in regular clothes. I have been to David`s Bridal and had a horrific experience and am now looking else where. Any advide you can give me would be great!!!