I had seen where it fit a little on the small size so I ordered up...I'm thinking I could have ordered true size and it would have been fine...on the good side though there is a side zipper and a lace-up corset in back so between the two able to get a perfect fit!  I had an underskirt for it and so glad that I did.  Without it would be a cute sundress, but with it gave it that 50's look.