There are buyers of used clothes online. I have been invited several times by my friends to sell my clothes on e-bay. They have been doing that for a long time. What they do is post a photo of the item, much better if it is worn by a model (not a professional model though). And the description should be appealing like a real advertisement. So instead of giving the clothes to charity, they sell it on ebay and then donate the money to charity. Much better, right?
But for me, I have a sentimental attachment to my clothes so I don’t have the intention to sell used clothes.