Mdm de Pompadour did not wear a pompadour. I have seen her portrait at the local art museum. She wore her hair close to the head with the braid wrapped around her head.

Women in the late 1800s wore a puffy hairstyle that we would call a pompadour. Those women named it because there was a fad involving the ancien regime lady, so that there were pompadour vases and pompadour purses. In fact, there was a colour scheme called "pompadour": sky blue with China rose pink, black, and metallic gold. Treasures in Needlework by Warren & Pullan (1855) has a pompadour purse I want to crochet.

After that, any poufy hairdo could be called a pompadour. When in the age of rock and roll, boys began wearing their hair high and swept back in the front, it was called a jelly roll or pompadour.