Re: Donating items to chairty thrift shops
As Kristin2349 says, Goodwill and other charitable resale organizations sell their unusable clothing by weight to be recycled, so give them everything, even what's got rips and holes.
If you'd rather the items you no longer want go to those in need for free, donate them to a local shelter or church.
If you do crafts or sew, think of keeping some ripped or holey items. I know people who make quilts out of their family's old clothing scraps or use the material to cover craft projects. You could keep some of the ruined things to harvest the good fabric and give the still wearable clothes to charity.
Follow the evidence where it leads and question everything.