It certainly happened to you. You have bought jeans that collided slightly after the first wash. Mostly it is 2-3% and manufacturers write it on jeans, but believe that a few decades ago it was much worse. You bought jeans that shrunk even by 10% and it could do 10 cm in length.
Today these jeans are called shrink-to-fit and are bought by real enthusiasts. All other pants are pre-shrunk. This is precisely what the funny story is related to.
It was the business traveler Hal Burgess who first introduced them in 1970. It was actually a coincidence because his hotel room was hit by a flood and when he wanted to wash his jeans in the hotel pool, they shrunk. However, this did not bother him and decided to offer jeans to people as a new pre-shrunk. In fact, they were two numbers smaller than they were originally, but so what… This began to write down the history of modern jeans and today you are buying jeans from the store that should not shrink so much.