funny story: I was in a locker room changing for swimming once and another person (a thin person) was changing as well, I know its rude to stare, but I kept glancing over at her, trying to figure out how and why she was holding a blue washcloth between her legs as she dressed - after about 3 minutes I realized that what I was seeing was the blue locker behind her because the thighs of thin people don't touch! ... it's so funny that it took me that long to get it, I almost laughed out loud!
so I will know I have lost weight when there is a crack of light between my thighs!
for now though, I know I've lost weight because I spend time poking my stomach flap to see if it is squishier (and smaller) !