I am long waisted and 5' 120 lbs. 34c. that being said, i purchased a size s regular and it fit perfectly. a petite would have been far too short. so i would recommend a regular size if you're a petite. also i have a big chest and this was very flattering. because of my chest size i usually do best with a v neck, but this classic peter pan collar looks great! i purchased the black. i agree with one of the reviewers who said that the nude color looked like a mess of a weave. the black and white o