I am a size 18/20 and ordered a 4x. this fits way too small. its horrible. I would return it but I think its tacky to return lingerie. if you wear a size 10 or 12 the 4x will probably fit you...good thing I have good self esteem, because trying this on could have realllyyy set me back! lol  make sure u ORDER A FEW SIZES UP! I AM NOT HAPPY WITH THIS ORDER AT ALL!!!!!!