RK Bridal in NYC. I went to Curvy Bride initially and then to RK Bridal where everyone I know has purchased their gowns in the last 5 years and I was so happy with the selection available in larger sizes. You can look on their website and call to see what size they have the samples in for specific dresses. The only thing is that they don't take appointments so it's walk-in only. I would suggest being the first ones there when they open.
Re: Plus Size Wedding Gowns
Good luck!