If you want a dress by s particular designer, you may have a little difficulty finding one that is brand new. A simple search of that designer's name will give you a glimpse of all the designs. If this designer is no longer in business, then that is better for you, because if you do find a dress by that designer, you know that it is one of a kind. One of the ways you can do this is to post an ad online and hope that someone responds to it. If you do get the style of dress you want and it is a large size then you need, it won't cost you a lot of money to have the alterations made so that it is your perfect fit.