Working clothes

Right now i'm sitting in a train and saw a construction worker, probably from commercial company. the funny question i that i don't understand the answer to. Why so many on them, not dirty or nothing, not holes in they clothes, no dirt, not a single dust and there's many of them. I'm over here coming home scrubing anything that i get from work for an hour and they seem to not have that problem, any clues why? 😅

Sometimes I think if it's worth breaking my already broken back. if they don't have over there.

I work as a residental maintenance handy man.