So here's some tips when buying a vintage dress -especially online!
1. Be sure to measure your ribcage area and ask the seller for this same measurement on the dress as well. This is the most likely place where you just can't get the zipper up. You may have a small waist but the ribcage will get you everytime.
2. Measure from your shoulder to your waist (and again ask for the same measurement from the seller as well). I've found this to be another area where the dresses are too shortwaisted for us. If there is a simple strap an alteration can sometimes work by adding into the shoulder seam.
Stay tuned for my upcoming book on more tips and tricks for altering your vintage dress!