Fedora, Traditional Men

The early 1950s switch from large lapels and ties to thin ones, resulted in shorter-brimmed hats, and this likely played a role in the fedora eventually being deemed a non-essential item. Also playing a part was the shrinking automobiles of the mid-1950s, which often made it difficult to wear a hat while driving. By the early 1970s, the fedora was seen as a dead fashion, typically only worn by older and/or more traditional men.

Source: Wikipedia > Fedora