Thank you all for sharing your experiences. I agree with CocoLion that it is good that there are so many options for clothing that is no longer useful to its owner.
Makrame, thank you for sharing your story about how resold clothing helped you. I agree that it is hard to see the flip side, which is lost jobs. It is difficult when economies change.
Rabbit, your examples show the "dark" side of donating, if you want to call it that. Sometimes we really don't want to help those in need but want to help ourselves. I remember one time a family in our parish had a fire and lost everything. The pastor of the church said that anyone who wished to donate to help the family could do that by putting money in the collection basket earmarked for the family. Well, apparently the family was inundated with offers of old refrigerators and old cars and the like. It was so bad that the pastor had to put a note in the bulletin saying not to offer this stuff but only to offer financial donations.
It also reminds me of a nonprofit where I used to work. We sent humanitarian goods to Russia on a periodic basis (not for natural disasters). The woman who ran the nonprofit started telling people to include $5 with each bag of donated clothing to cover shipping costs (it is very expensive to ship overseas). Of course, some people were incensed.
Anna, you are quite right that my clothing size is not going to be helpful to most people, no matter what I do with my used clothing—even if it's in pristine condition.