Going to be honest here ladies...  I'm 5'8", and 180 lbs after having my first child.  About a year ago before having a baby, I was 140 lbs on a full stomach.  Size 6 jeans then, size 12+ now.  (Breastfeeding, if anything, has made me gain more weight than lose it, sadly.  I was 170 lbs when pregnant.)
Bought this in medium size in hopes to get close to my old waist size...
Alas, I have a long torso, and this cincher isn't long enough to work right.  I have fat oozing out my top beneath my bra, or fat oozing out from my hips.  I say ooz, because pregnancy fat looks that way.  If this were longer, it would have been great.  Even with an extra cincher over it, doesn't help me.  They don't make anything long enough to help me.  Hope this helps someone.

Apologies for the reality of the pictures...  Not pretty.