Bought a plus size for me and love it so much that I bought two more for my daughters in the regular size.  The plus is MORE than generously sized.  It's easy to adjust although you must pay attention when they say not to adjust while you're wearing it!  You will inevitably adjust it the wrong way.  For jeans and dress pants, it corrects slightly overlarge waists and lies flat and invisible under overhanging tops or shirts.  It seems to work better than a leather or fabric belt and you feel like you're not wearing a belt at all--just that you have a trim line in your clothing and you don't have to hike up your pants all the time.