I did order a size up and glad I did only because it is a one piece outfit thus I had to wiggle into it over my head. I have a classic hour glass shape and there was no way I could pull it over my hips, had a challenging time with pullling it over my head. The "corset" ties are real though, so I was able to sinch in the waist (though is was still a little too big there). It is low cut, so plan on wearing a cute push up bra to enhance the "girls".  BONUS an adorable pink petticoat comes with it. The colors and material are very nice. Great buy!