A bowler hat was type of hat.

Whilst visiting Victorian England to look into "the Crimson Horror", the Eleventh Doctor wore a bowler hat. (TV: The Crimson Horror)

The Fourth Doctor briefly wore a bowler hat he found in Fang Rock lighthouse whilst investigating it. (TV: Horror of Fang Rock)

In the 1970s, a Time Lord messenger dressed as an English businessman, complete with bowler hat and umbrella, appeared to the Third Doctor to warn him that the Master was on Earth. (TV: Terror of the Autons)

On Earth, the Council of Dead wore identical pin-stripe suits and bowler hats to cover their horns. (PROSE: Snowfall, Attack of the Snowmen)

Hargreaves wore a black bowler hat while in his butler form. (AUDIO: Aquitaine)

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