It turned out to be the friend that I least suspected. He rarely called me by my real name, using one of my nicknames instead. After a while I realised, he would always go in my bathroom after I had a shower, and spent a fair bit of time in there. After he left, I started checking and invariably the undies I had been wearing that day were gone, and sometimes others.
I often had more than just skiddies in my undies by the end of the day and my mother refused to wash them. I always waited until I was almost out before I washed them so there would have been lots for him to choose from. In the beginning I was a little worried why he was taking them, especially when he often took ones with more than just skiddies.
I guess he put them back a few days later, thinking I wouldn’t notice. If I am correct it worked because I think he was doing it for a lot longer than I realised. Being guilty of the same thing I never said anything to him and he kept doing it after we left school and started working. I also discovered he was wearing them before he put them back.