Another one...

Flea market

This is an open-air or street market that sells a wide variety of merchandise, most of it secondhand and some of it masquerading as antique. The first flea market – then called marche aux puces – was in Paris, but it is now common in all parts of Western Europe and in Great Britain as well. The reason for the name is simply that there were so many secondhand articles of all kinds for sale that they are believed to father fleas.

I'll add to your thread, Jim.

As incredible as it sounds, men and women took baths only twice a year (May and October) Women kept their hair covered, while men shaved their heads (because of lice and bugs) and wore wigs. Wealthy men could afford good wigs made from wool. They couldn't wash the wigs, so to clean them they would carve out a loaf of bread, put the wig in the shell, and bake it for 30 minutes. The heat would make the wig big and fluffy, hence the term 'big wig.' Today we often use the term 'here comes the Big Wig' because someone appears to be or is powerful and wealthy.