Fangirl

Kate Stewart described Osgood's behaviour as "fangirling" when she noticed that Osgood had chosen to wear a long, multi-coloured scarf for her first encounter with the Doctor, in Trafalgar Square. (PROSE: The Day of the Doctor)

The Eleventh Doctor complimented her on the scarf, but Kate felt that this was not the time for it. (PROSE: The Day of the Doctor) Osgood had previously donned a version of the Third Doctor's green velvet outfit on a mission with Jo Jones, (AUDIO: Tidal Wave) and would later update her wardrobe to include a bow tie, in the style of the Eleventh Doctor, on meeting the Twelfth Doctor. (TV: Death in Heaven)