The stuff is resold in secondary markets in the villages. Especially the used panties.

Too cheap to believe always comes with caveats.

But to others who can’t afford anything else this is a godsend.

If there's one thing I've learned here more than anything is that Khmers never let anything go to waste. They have a knack of finding value in everything, to the point where people will make a living (meagre living, admittedly) from dragging carts around all day (sadly, often children) picking up anything that they can possible create some value out of, no matter how small that value. Our westernised 'throwaway' society can learn a thing or two from the Khmers in this respect. In the UK, many years ago, we had 'rag and bone men' who did something similar. They would walk up and down our street with a cart every week or two when I was a kid, shouting 'rag and bone.... rag and bone...' and people would come out of their houses and give them useless bits of junk they no longer needed and probably couldn't even sell. These rag and bone men would somehow manage to find some kind of value in whatever they were given. Of course, this was in the same era that milk came in glass bottles which were cleaned and re-used (not recycled), people would get 10p cashback for every glass soda bottle they returned to the shop, groceries were packed in paper bags instead of plastic and electronic items were designed to be easily repaired when they became faulty, instead of people having to buy a new one.

I'm aware I completely went off on a tangent there, but my main point is, it really wouldn't be difficult to find a home for a large bag of clothes here, no matter what you decide to do with them. You'll either be helping to clothe someone who desperately needs it, or provide someone with a small amount of money when they sell them on. Either option works well.