I was nervous about sizing because I generally wear a 2, but can be up to a 6 in based on the tightness of the dress (I am pear shaped). The two was perfect (even loose on the bottom). Getting the zipper over the seam was tricky even with someone to help me zip it. I was also concerned about length- I wore 3.5 inch heels and am just shy of 5'6" and it hit perfectly just skimming the ground.