for any of the clothes I wear outside of the house, I take them off as soon as I get home. It really depends on what I do with them when I'm out on how I'll reuse them.

If I'm at a bar ... they're done, 1 use only, washed.
If I'm around town running errands ... no biggie, I'll reuse T's and jeans all the time.
Underpants and socks ... the second they come off, they're done.