We were (1980's), urine stained suits etc. My mate plunged his hand into a bin liner to discover we had been donated a bag of [very] dirty knickers - nice!
Jumble sales went with the decrease in natural fibres. After a jumble sale, the "rag man" used to take any clothes left over. Synthetic materials no good - the rag man stopped coming and the chore of dumping the left over stuff made them not worth doing.