I usually wear a 2 if the dress is fitted in the bust and a 4 if it's fitted in the waist or hips. I tried to order both sizes but the 4 was already taken for that weekend. I loved the dress so much that went ahead and just ordered the 2 with my fingers crossed, hoping it would fit. I got lucky and it fit perfectly! I have a small bust so I can see how the dress may fit tighter for girls that are more well off than I am up there. I wore this to a fraternity formal and it was great! It can easily be dress up or down depending on the jewelry and shoes you wear. I wore nude heals and a cheap purple chunky necklace. It was super comfortable and very flattering. I would absolutely wear it again if I had the chance.