[jshevek]

I interpreted it as: Generally the clothes they wear are either too nice or too nasty for wiping clean wet hands. At the library and Starbucks they wear clothes appropriate for wiping hands. Too nasty makes sense to me, if you work landscaping, construction, maintenance, auto repair, possibly even in food service.

The too nice viewpoint is less relatable, but could be from fastidiousness or OCD applied to the clothes themselves, rather than being concerned about your hands.