Pith helmet

A pith helmet was a headgear used to protect from the sunlight on tropical parts such as Africa and southern Asia.

A pith helmet was seen in the wardrobe when the Tenth Doctor chose his outfit. (TV: The Christmas Invasion)

Iris Wildthyme wore a pith helmet and goggles when she, Panda, Simon, and Barbra first ventured out into the jungle on Valcea. (PROSE: Enter Wildthyme)

Godascre and his soldiers wore pith helmets during their encounter with the Twelfth Doctor, Bill Potts, and the Ice Warriors. (TV: Empress of Mars)

K9 Mark III wore a pith helmet on Egypt. (COMIC: City of Devils)

The Fourth Doctor claims a pith helmet would come in handy should he ever visit Chloris again. (TV: The Creature from the Pit)

Captain Cook, an intergalactic explorer, wore a pith helmet. (TV: The Greatest Show in the Galaxy)

Some pith helmets were seen on the train coach carrying Jack Harkness and his soldiers. (TV: Small Worlds)