This would be easy to do with wide piece of elastic & 2 yds of material attached to a tank top. Scattered Thoughts of a Crafty Mom: Guest Post: Urban Princess Dress Tutorial from Domestic Bliss Squared
Basic Pillowcase Dress ~ This tutorial for simple pillowcase dresses will knock your socks off. Love that pillowcase dresses are easy. Less time intensive than most dress patterns and more playful, too! -love this idea!