Quickly go through and grab all of the Summer clothes that you have not worn this Summer.
You can keep one 'special occasion' piece that you haven't had the opportunity to wear, and one other thing that you just can't part with.
Put the rest in a bag, put it in your car, and drop it at the next donation center you see.
(Then do this with your spouse's and your kids' clothes, and doing laundry and getting dressed will be so much easier!)