Houndstooth
Brigadier Alistair Gordon Lethbridge-Stewart wore a blazer of houndstooth tweed 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 [+]) and when he helped the Ninth Doctor to fight Mondasian Cybermen. (AUDIO: Way of the Burryman [+], The Forth Generation [+])
During his retirement to the Victorian era, the Eleventh Doctor wore puce houndstooth trousers. (TV: The Great Detective [+], The Snowmen [+]) He also wore them during his travels with Valarie Lockwood, (AUDIO: The Inheritance [+] - Victory of the Doctor [+]) most notably when dealing with the New Dalek Paradigm including Special Weapons Daleks. (AUDIO: Daleks Victorious [+] - Victory of the Doctor [+]) Eventually, he took to wearing them during the Siege of Trenzalore. (TV: The Time of the Doctor [+])