The very first overalls, originally referred to as "slops," were created in the 1700's. They were worn by working men and considered a symbol of low class.
The material was not denim, but instead a tough cloth. They were built for durability and not for comfort and were not fitted well at all. Men usually wore them over another pair of pants.
Around the 1850's, overalls became more convenient for the workday. These changes included pockets for tools, including rulers and pens and different colors. White for painters, blue for farmers and pinstripes for railroad workers. Shortly after, manufacturers started using denim to make overalls.
It wasn't until the 1960's when overalls became a fashion statement. Retailers began producing them in high-end fabrics and a large number of colors. Plaid and patterned overalls also showed up in boutiques.
In the 1990's, many popular hip hop artists wore overalls with one strap unbuttoned, which started a trend that made its way through American high schools.
You don't see as many people wearing overalls as they were in the 90's but you can still easily buy them in stores in many different colors and prints.
Do you have a pair of overalls?