I normally wear a size 1X, 14-16 in FN, since this dress is latex I decided to size up giving I have a fupa and hips I didn't want it to be too tight possibly causing it to not fit, it was toooooo big? Keep your regular size!! it runs big so if you think you want a lose fit it comes with a lose fit when you get your normal size. If you're in-between sizes like me, for ex. 1X or 2X; go with the smaller size of the option