21. Scarves
Pretty much everyone's grandmothers have a collection of scarves. Years ago, they were all trendy with hair tied or shoulder length. But nowadays, many people donate them immediately to thrift stores without thinking. Stop immediately! Before giving away, remember to check the label of each scarf. You never know if your grandmother has a Hermes scarf that will be sold for a few hundred dollars.
Souvenir bandanas are also very popular, especially among souvenir collectors from somewhere. Always double-check on eBay to see if anyone has sold something similar before. Try to price your objects on the football field at the prices asked by everyone.