From a recent podcast, starts at 25:35 in. She was talking about how uncomfortable the bra she was wearing was and then brought up thongs:
I'm used to thongs. I've gone numb in that area. I've just had to acquiesce to them ... I didn't wear thongs, didn't wear thongs. I was resisting it, resisting it. Finally started wearing them, they were so uncomfortable for a couple of months, and then I forgot I had one on and peed through one once.