News Note: A Bill Has Been Introduced in the Illinois Legislature Limiting Women's Hats to a Diameter of Eighteen Inches
Record Group 46: Records of the U.S. SenateSeries: Berryman Political Cartoon Collection
This illustration entitled, "News Note: A Bill Has Been Introduced in the Illinois Legislature Limiting Women's Hats to a Diameter of Eighteen Inches", by cartoonist Clifford Berryman, which appeared in the Washington Evening Star on April 24, 1909, depicts the serious nature of issues caused by women wearing large hats, especially for men sitting behind them at sporting events.
Two women with enormous hats sit in the front row of a sporting event. One is holding a scorecard and pencil. The men behind them are maneuvering to see around them. A man further back is standing up calling to a policeman, “Officer, do your duty!” The man wears a sport coat, tie, starched collar, and a straw hat. The other men in the stands are similarly dressed. The police officer is standing amid the crowded stands. His helmet says, “Hat Cop.” He holds an 18 inch ruler and measuring tape.
This is kinda a stupid question, but what type of hat that Victor is wearing?
It's not a stupid question at all.
The simple answer is that it's a cap.
They were quite common at the time as workaday wear for a laborer, as sportswear, as flashy collegiate fashion, and as something basic you'd stick on a young boy's head. Sometimes they'd come in leather or suede, but more typically they'd be made of woven fabric like wool, tweed, or serge. Many designs have a button on top where the wedge shaped fabric segments comprising the crown converge. 'Flat caps' are sewn with a different, boxier panel pattern eliminating the button.
Caps got sort of egregiously puffy/floppy in the 1920s (along with a lot of other egregious things about the 20s). Below is Babe Ruth wearing what would have been considered fashionable at the time. Viktor's is pretty conservative by comparison.
The less simple thing to answer is specifically what type of cap. There are a lot of variations, classification is a little hazy and loose as far as I can discern, and the parlance for them has changed over the past 100 years. For instance, you'll see a lot of people calling them 'Gatsby hats' or 'newsboy hats' now, but they were definitely not referred to as the former within the 1920s, and the latter is doubtful. I haven't seen any old catalog entries list them that way. Mostly they were called golf caps, cabbie caps, driving caps, or sports caps.