No such thing as Charity shops down here of course but there is the 'Obroni whawu', clothing from the dead white man. I've posted about it on here before and it can be a source of great bargains, all my wear comes from there.
It's a huge business here and shipped from Europe and the US.
You can pick up top brands, often designer stuff for very little money.
There was a trade in underwear too but the government banned it a couple of years ago. The Chinese underwear is very cheap so really no need.