There are two rather popular seamstresses one of which is in Fairfax, VA. The other is in Gaithersburg, MD. Both do excellent work at reasonable prices. PM me if you would like their information.
I lived in Nova at the time of my wedding and drove to BWI airport area to see Diana Adams of http://www.MarylandSeamstress.com. Was very glad I made the extra distance. My mom lives out that way so I just visited her too ( well she went with me to one fitting) Diana is very experienced, took my gown in 8 inches made it fit me perfectly and did a hem and bustle that held up all night. I bought a veil from her too! Her prices were awesome and the fittings were a breeze!
Re: Seamstress recommendations in the DMV?