One popular style of the beanie during the early half of the twentieth century was a skullcap made of four or six felt panels sewn together to form the cap. The panels were often composed of two or more different colors. This type of beanie was also very popular with college fraternities as they would often incorporate school colors into the beanie.
Another style of beanie was a formed and pressed wool hat with a flipped up brim that formed a band around the bottom of the cap. The band would often have a decorative repeating zigzag or scalloped pattern cut around the edge.
Beanies are often constructed from yarn, using knitting or crochet techniques. While the beanie is considered a fairly humble piece of clothing, it has been elevated to the status of regional art.