A bit of a latecomer here (and my first attempt at posting seems not to have worked!), but I thought I’d add my experience. I had Diana (www.gowndoctor.com) alter my used wedding dress. I needed it taken out, I changed the neckline, and I needed an extra half-inch in length AND the dress was 100% lace. She did it all and the fit was absolutely perfect. Not cheap, but I thought the price was fair and reasonable for the amount and complexity of the work coupled with really fantastic results. She also altered my mother-in-law’s custom made dress that turned out to have some weird fit issue. She’d been told by other tailors it couldn’t be fixed, but Diana did it and she was thrilled.