Heather grey seems appropriate since the day they filmed this scene London's sky was just about this color.
The BBC was very tight-lipped about the 50th anniversary episode beforehand. Some of our few sneak peeks at "The Day of the Doctor" were provided by the location shot in Trafalgar Square. It's hard to miss Matt Smith dangling in the air from his TARDIS in the middle of London.
The Eleventh Doctor hangs from the TARDIS in silhouette on this heather grey, 90% cotton 10% polyester shirt. Machine wash cold. Tumble dry low or lay flat to dry. Imported.