I also just got in touch with Rae of The Handsome Butch, who among many things is a clothier with Bindle & Keep in NY. She specializes in suits for butch/queer types. Her email is Rachel@BindleandKeep.com.
Your location would be helpful so that other people in your area might be able to recommend local tailors. I can update this answer with your location if you want to let me know.