This idea is from my girlfriend used to attend a church in Phoenix that held a Ladies' Annual Fashion Exchange that sounded like a blast!  This could be done for kids, men, families and could be held just about anywhere.    

Any lady could attend and participate at no charge.  They just showed up with a bag or two of gently used clothing, shoes, handbags, accessories.  Nothing could have stains, rips or snags, broken zippers and the like.  At the entrance there was a table where someone counted up the items they brought and then gave the ladies a ticket that entitled them to pick that many items in exchange.   Then they took their items to the appropriate tables and laid them in neat piles.  (Tops, shorts, skirts, dresses, jeans, shoes, accessories, etc...)   They had a couple of make-shift dressing rooms and a few people brought desserts and other refreshments.  

My girlfriend had lost a ton of weight from the stress of becoming a single mom and needed new clothes desperately, but couldn't afford it.  She took several bags of her things and was able to get basically a new wardrobe of clothing that fit her great!  She got everything from casual clothing to suits and matching shoes to boot!  Pardon my pun.   A few pieces were new with tags.  A few were designer labels.  She was thrilled to have 'new clothes' and was able to give away her nice things to someone else.  

Everything left over was boxed up and taken to a shelter.  

what great idea

In a less formal fashion a group of friends and I get together once or twice a year and bring all our unwanted clothing.   We then go through it and try to convince someone else to take it.

Whatever isn't claimed goes to a local charity.   That's often a lot since we vary in size quite a bit. :)  Some folks have neices and daughters, though, so that broadens the interest.

We come home with less than you might at the above, but most of us want to clean out our house, find a couple new things to wear, and have a good time.  We don't make enough time to be social, and this makes a good excuse.