This was so hot. I relate to it because my mom also used to wear dark coloured thongs and wear light coloured night gowns/yoga pants over it. By mere standing behind her one could see clearly panty line and shape of her ass. I still remember my friends coming to my house and I used to be fearful about they seeing her like this. Sad but exciting part is they saw her few times like that and am pretty sure discussed about her, though not in front of me.
Once I remember she was wearing black colour dotted calvin klein thong and over it cream coloured tight thin material pants. I went with her to buy shoes and while was trying out shoes, other men in the shop were checking her out as they could clearly see the thong impression. I was kinda embarrassed about it but could not do anything.
At home she used to wear these black/blue coloured thongs and light pink coloured cotton gown over it. I have numerous time saw her from the back while she was bending down, doingsome work etc etc. That was very hot. I even secretly took pictures of it but deleted it afterwards.