A friend of a friend organises shipping containers to go out to countries in Africa twice a year. They collect furniture from schools that are being refurbished (and would otherwise be thrown away in landfill), to go schools/orphanages, and fundraise the cost of shipping it out there. They collect clothes, shoes and toys to pack around the furniture and they ask for donations in ANY condition because the places they are sending it to are so poor. As other posters have said they often only have the clothes they are wearing and little else. The clothes are not sold, they will be given to the children in orphanages or handed out at vaccination centres for example.
We have very high standards in the west - clothes with a stain, or worn shoes, we would reject. The lady I spoke to has been out there and says they will literally use everything - nothing is wasted. Clothes that are torn will be remade into something else. I was worried too as it seems we are sending our scraps but after talking to her she said send everything. I had put all my donations in those large laundry bags and she said they would be thrilled with them.
It does make me feel sometimes how wasteful our life in the West is - I often replace things when they look 'scruffy' when in reality I shouldn't care - I can't help it though.
I always make sure I don't send anything dirty though - I do have standards!
On another point we sponsored a family in Togo in Africa and when we got the photos of the family, the father was in rags - his trousers were literally hanging off. Considering he was having his photo taken I guess he didn't have any others. It was a bit of an eye opener for my kids.
OP I think you are probably worrying too much, but you are doing a great job by helping, don't 'bow out' ! I thought it was quite sweet that you were sewing the buttons on!