When I went through a real financially difficult time (partner had left and was giving me nothing and left me in debt) I never told anyone, but people could tell I was struggling, and I was given loads of clothes, I never asked, I felt too embarrassed, but I did really need help. However, my boys are naturally very skinny, while one of my girls was extremely tall, so when I got clothes given to me by friends and family for them, half the time they wouldn't fit. I would have felt massively ungrateful for saying 'No thank-you, these don't fit!' because despite hating the fact, I needed help for my kids sake. I would always refuse peoples help at first, but my friends were adamant. (One lovely friend even let herself in with my spare key and filled my freezer, never got over that one! bless her!)
but yes, I did sell on some of the things they had given, and it meant I had money for food and heating, however, the only difference is most of the lovely folk giving me things would say 'Here you go, you might be able to use this for your DS, if not, just donate it or sell it!'
I'm not sure I would have just taken to sell on without that being said to me. I understand why you are a bit hurt, it seems quite duplicitous, however, if you need the money yourself, sell on your own things and don't give them away, as if you are giving them to someone, that says you no longer want them, and they are theirs to do as they please. xxxx