the.com/bearskin

means A tall, furry military cap made from bear pelt, traditionally worn by certain ceremonial infantry and guard regiments.

from Straightforwardly from 'bear' + 'skin' — the cap is literally made of bear fur, originally black bear pelt mounted on a cloth-covered frame. Grenadiers adopted the style in the 1700s, partly because the height and fur made a soldier look taller and fiercer in battle, intimidation being a legitimate weapon. The style stuck around for ceremonial regiments — most famously the guards at British royal palaces — long after it vanished from the actual battlefield.