im sure Angie has genius ideas on this, but my own trick is to slide a knitting placeholder onto the hanger of items that I've worn--I may even have been known to get completely anal about this by colour coding them to the number of times worn That way I can keep the item mixed in with my regular pieces for easier wardrobe planning.
You can buy these at Michaels in packets-- the ones I get look like tiny rubber bands. I can add a pic if you want.
I do gently brush and hang worn items separately overnight after wearing and sometimes hang them outdoors for a while refresh. I'd have made a good Downton Abbey valet!