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Ushanka is Russian hat with round crown and ear flaps, usually made of fur. This hat is one of the symbols of the Soviet Union because it was developed and popularized in Russia during Civil War. Today ushanka is standard winter military hat in many countries, but also a fashioned hat made of different materials, not just fur.
Pork pie hat is round hat known from 19th century, called that because of similarity with that time pork pie dish. The most popular were from 1830 through American Civil War, but in the 20th century, it was popularized again thanks to actor Buster Keaton, and, after that, thanks to jazz musicians such as Lester Young and Charles Mingus.
Hard hat is a necessity on any construction site today. But it wasn’t always so. Nor the first hard hats that appeared were that efficient. You can read more about history of hard hat here.
Sombrero is a Mexican hat famous for its very wide brim, high and pointed crowns and a slightly upturned edge. Over the last several centuries, sombrero and poncho managed to become the iconic part of the Mexican society. Today this hat is worn not only in Mexico but also all over the world.