Type words here. I'm 4'11" and 90 lbs. the XS in Betty Rides fits me perfectly. They're the only co. that actually fits me without tons of waist bulk. I have the siouxsie pants. They are the same fit as the skinny cargo. Keep in mind that you really do not wear your pants on your actual waist. i'd go more by the hip measurements. They also run a little on the shorter side which is great for me! Hope this helps!