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 Commander Kaagh from the Sontaran Empire's Special Assault Squad and sole survivor of the Tenth Sontaran Battle Fleet; (TV: Enemy of the Bane [+]Phil Ford, The Sarah Jane Adventures series 2 (CBBC, 2008).) and when he helped the Ninth Doctor to fight Mondasian Cybermen. (AUDIO: Way of the Burryman [+]Roy Gill, Old Friends (The Ninth Doctor Adventures: Series 1, Big Finish Productions, 2022)., The Forth Generation [+]Roy Gill, Old Friends (The Ninth Doctor Adventures: Series 1, Big Finish Productions, 2022).)