So press pause on Tetris, and get out your sewing machine, because it's time to build this thing!
Step 1: Materials
A key part of this dress is how stretchy it is. Be sure to get fabric that's got some give to it, so your dress will fit snuggly.
Step 2: Prepare the dress
I'm 5' 10", and so after accounting for the black borders and hemming, cut my dress to be 37" long, and this can obviously be toyed around with for your own.
After you have cut out this rectangle of gray, pin in a small hem and set aside. No sewing quite yet.