The Doctor grasps at familiarity through his wardrobe (prompt: hats, references to One, Two and Three)
A Viking's Life for Me
. . .
The Doctor settled the furry cape about his shoulders vaguely thinking he'd worn fur before and liked it. Capes were familiar. It flattered his newly brown hair but was lacking something somehow.
"A hat," he muttered. "It needs a hat."
Three trunks later he unearthed something that not only matched the lovely brown fur and fit his head perfectly, it had memories attached to it. Right now, things with memories attached were not to be shirked.
Adjusting it, he took a good look in the mirror. A space helmet for a cow! Perfect. He was sure the Brigadier would agree.