Tailoring by Esmerelda in Alexandria - she's great and fast!

Check with Young's tailors in Vienna, VA. That might be a tight turnaround for them, though.

Stitch by Ashraf in Arlington. I got my bridesmaid dress tailored there last Sept and it was quick and looked great

Nordstrom does tailoring and they’ll work on clothes not purchased there. Some more recommendations here:
https://www.dcurbanmom.com/jforum/posts/list/1308479.page#31435488

You might want to call ahead and see if they’d be able to do the work within your time frame.

It’s been a few years so I don’t have a specific name to recommend. However, many dry cleaners offer alterations and I think some of the major department stores offer alterations even for clothes not purchased there. Good luck!!!!

ISO bridesmaids dress tailoring in DMV are. Need it turned around in the next three weeks, willing to drive to MD/ Va. thank you!