Is there anything you can’t do with painters tape??
We have a wedding this weekend with three events (and therefore three dresses). All of my pre-baby dresses are still too tight in the chest to zip, so it meant some shopping. I had one dress from a wedding in November, found another online, and had to hit the stores for the third dress. I found this at 50% off the day before we left. The top was so flattering, but the skirt had about twice as much fabric as anyone could ever need.
Twenty minutes later, I’d seamed and hacked along my nice straight painters tape lines, and ended up with a nice A-line. Huge improvement!