Several times I've started a thread offering the clothes I can no longer wear to someone who needs them but every time I've erased it (not sure why). But I recently gave them to a large family (ha!) who really, REALLY needed them so I don't feel too guilty.
A clothing exchange on here would be a FABULOUS idea! I have tons of clothes in various sizes and vacuum sealed plastic bags just waiting for me to get down to those sizes, so every month or so I do a wardrobe purge. I'm not sure what I'd do without the securiy of those stashed clothes.
When I hit clothes sizes that the family-in-need cannot use (lots of ages and sizes in that family) I really will post it here... I pick up lots of nice stuff in Greenwich,CT area tag sales so some of those clothes are really nice!
It took a long time to get used to wearing clothes that FIT instead of the baggy ones I kept wearing.