Bookcat - I'm amazed your charity shops don't want them - down here in Somerset they are happy to take any number you want ! I just can't believe they don't take 'em.
In fact, all our charity shops don't even care about old raggedy clothes etc.. - they sell anything unsaleable for rags for recycling.
And Witty - I'm in "the county town" - where's this shop

sounds like a good idea.
[ Actually, charity shops now face competition - firms that advertise cash for "unwanted" clothes. They are now taking other articles as well, I noticed in the window of one of their shops in Wellington. So they are taking stuff that might otherwise provide help for those in need, and turning a profit on it . With some of them they claim a percentage goes to charity, but the wording is usually rather obtuse - like the 1,000's of plastic bags that come through my door each week asking for, yes, you've guessed it, "unwanted clothes", for some pop-up new charity.....
Handy for the rubbish, saves buying bin-liners and waste sacks ....