As children, we would each get one set of new school clothes every year (I have five siblings). The rest was supplied by hand-me-downs and donations. We'd keep these clothes in tip top condition (or as tip top as rowdy kids could keep them) by wearing them only for school or other special occasions. When we got home, we'd change into harder worn clothes.
I've continued doing this as an adult. When I get home from work, I'll change out of my suit into comfy, relaxing clothes. This could be dress slacks with worn cuffs or shirts with a discoloration (from what, I don't know – the hubby gets mysterious grease drops on his shirts). If I'm not going anywhere or expecting anyone, it could be that faded frosh t-shirt from first year university, the one with 'Let's Merge' and other witty accounting pick up lines on it, and that 80's style pair of jeans with the knees hanging out of them (very George Michael). Oh, and the crazy holiday socks my Mom always buys me.
What does this do? It extends the life of my pricier business clothes (I can also often wear them twice without washing, saving more wear and tear). It delays the used clothes' trip to the landfill (delayed even longer if I use them for painting or gardening clothes, and after that for rags). It saves me time by limiting the clothes shopping I need to do.