Flat cap

Romana wearing a flat cap. (TV: The Stones of Blood ^[+]Loading...["The Stones of Blood (TV story)"])

A flat cap was a type of hat.

Following his regeneration, the Third Doctor tried on a flat cap. Upon looking in a mirror, he decided against wearing it. (TV: Spearhead from Space ^[+]Loading...["Spearhead from Space (TV story)"])

Romana I wore a flat cap of tartan on her first visit to Earth. (TV: The Stones of Blood ^[+]Loading...["The Stones of Blood (TV story)"])

Professor Jericho and Dan Lewis wore flat caps of herringbone-tweed during the early 1900s. (TV: Survivors of the Flux|The Vanquishers)

Wilfred Mott wore a flat cap of houndstooth tweed when he reunited with Donna Noble and the Doctor in his fourteenth incarnation. (TV: Wild Blue Yonder ^[+]Loading...["Wild Blue Yonder (TV story)"])