We all know the beanies are very popular in our life. In fact, beanies have a long history. Most people con't the things about the beanies.
The beanies appear to be primarily an American style. Almost all of the images we have noted have been from the United States. We have noted them in many snap shots--but not in formal portraits, because it was such a casual style. They alsp appear in movies. A Canadian reader reports that his mother reports that his uncles used to wear beanies in the 1940s and 50s in Saint John. He is not sure, however, about the ages. We have not noted them being worn in Europe.
Beanies were also used at American colleges as part of freshman initition. Colleges had the beanies for many years. Freshmen were required to wear them to differentiate them from the rest of the college. They were still being used at some colleges in the early 1960s. Also, graduation hats were the beanies with a square on top. I do not know the signifigance of this, just noting the issue. Also, I have seen academics wearing a beanie in medieaval times. Beanies were also used by fraternities, lodges, and other male social clubs.
Now more and more people like the beanies. If you also like them, you can buy them online. There are many different types online, believe you will find one that you like.