I have some undercrackers that Mrs Red managed to bleach a large portion of. I wouldn't mind, but the bleached part is at the back and has turned a very skidmarkesque brown.
I'm not allowed to throw them away, "They're next to new" but I'm not allowed to wear them if there is a risk of me being run over.
As long as you don't get run over from behind there may not be an issue with them looking like you've s*1t yourself...