Ascot hat

An ascot hat  was similar to a flat cap.

Brigadier Alistair Gordon Lethbridge-Stewart wore a tan ascot hat when he helped the Bannerman Road Gang to foil Bane including Wormwood and Cal Kilburne as well as Sontaran Commander Kaagh; (TV: Enemy of the Bane) and when he helped the Ninth Doctor to fight Mondasian Cybermen. (AUDIO: Way of the Burryman, The Forth Generation)