The Glengarry bonnet is a traditional Scots cap made of thick-milled woolen material, decorated with a cookie on top, frequently a rosette cockade on the left side, and ribbons hanging behind.
It is normally worn as part of Scottish military or civilian Highland dress, either formal or informal, as an alternative to the Balmoral bonnet.
Traditionally, the Glengarry bonnet is said to have first appeared as the headdress of the Glengarry Fencibles when they were formed in 1794 by Alexander Ranaldson MacDonell of Glengarry, of Clan MacDonell of Glengarry.
MacDonell, therefore, is sometimes said to have invented the glengarry bonnet.
– but it is not clear whether early pictures of civilians or fencible infantry show a true glengarry, capable of being folded flat, or the standard military bonnet of the period merely ‘cocked’ into a more ‘fore-and-aft’ shape.
. The first use of the classic, military glengarry may not have been until 1841, when it is said to have been introduced for the pipers of the 79th Foot by the commanding officer, Lieutenant Colonel Lauderdale Maule.
It was only in the 1850s that the glengarry became characteristic undress headgear of the Scottish regiments of the British Army. By 1860, the glengarry without a diced border and usually with a feather had been adopted by pipers in all regiments except the 42nd (Black Watch).
In 1914, all Scottish infantry regiments were wearing dark blue glengarries in non-ceremonial orders of dress, except for the Cameronians (Scottish Rifles) who wore them in rifle green, and the Scots Guards, who wore peaked forage caps or khaki service dress caps.
Between 1868 and 1897, the glengarry was also worn as an undress cap for most British soldiers until replaced by the short-lived Field Service Cap.
When this was revived in 1937, the Dress Regulations for the Army, described the Universal Pattern Field Service Cap.