Recognised charity shops often do this, but recently I've noticed some leaflets and bags from companies which clearly just hope you'll assume are charities, but aren't.
This morning's was from a company called "Clothing Aid (Europe)".
Dear Householder. We need your HELP. If you have any unwanted Clothing, Bedding, Curtains, towels, paired shoes or handbags that you wish to dispose of, we would be delighted to collect them from you. People in developing countries find it extremely difficult to afford new clothes but would be happy to purchase clothing you no longer require.

What the fuck? They want me to GIVE them stuff to SELL to deprived people in the third world. They may well have made the stuff in the first place...