So I made another one! Since its summer, I made the short sleeve version, and I definitely prewashed the fabric this time! I intended to make the dress longer than the pattern but completely forgot about it at the critical scissors to fabric moment, so fingers crossed the fabric doesn't shrink anymore after its prewashing - at the moment the length is fine.
I cut out a size smaller than last time (when I foolishly followed the size chart on the envelope) and it was still a little too big! I took it in on the side seams till I was happy with the fit. Oh, and this was a stash busting project, so yay for me!