As detailed in this thread:

http://forums.teamestrogen.com/showthread.php?t=37873

I have a terrible time finding bras that fit me. Today I went to Sylene of Washington, which is located in Chevy Chase near Mazza Gallery -- a few blocks north of Western Ave and just off Wisconsin Ave.

I had a wonderful experience shopping there. The salesperson was so helpful and understanding and did not try to convince me that I should just be happy with whatever she thought should fit me no matter how uncomfortable it was.

They sell swimwear as well as a good variety of lingerie.

Their website is:

http://www.sylenedc.com/

I recommend a visit if you're in the area!