Flare

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Flare
A triceratops is kept at bay with flares. (TV: Invasion of the Dinosaurs)
You may be looking for Flared clothing.

A flare was a device that became intensely bright when lit.

In the 1970s, while in the London Underground, the Brigadier used flares to ward away a triceratops while the Third Doctor prepared charges to destroy the area. (TV: Invasion of the Dinosaurs)

On Dido, Barbara Wright used a flare gun to kill Sandy when she believed the creature was about to attack Vicki. (TV: The Rescue)