To wash or not wash?

I remember in the past I heard how an individual chose to wear their jeans everyday and not wash them.   I also remember my college professor for English basically appeared as though he to had decided to do the very same thing.  I mean he never seemed to have any hygiene problems as far as I could tell.

I do not know if I could wear my jeans or any of my clothes for a period of time without washing them.

This is not for me.  But what do you think?