MacDonell of Glengarry and balmoral bonnet MacDonell, thus is sometimes said to have invented the glengarry. But it is not clear whether early pictures of civilians or fencible infantry show a true Glengarry Bagpipe Hat. Folded capable of flat or the standard military bonnet of the period merely ‘cocked’ into a more ‘fore-and-aft’ shape.
May be the first use fo the classic military glengarry not until 1841. The commanding officer Lieutenant Colonel Lauderdale Maule, introduced the for pipers of the 79th Foot.
It was only in the 1850s that the glengarry became characteristic undress. Headgear of the Scottish tam regiments of the British Army. Until 1860 the glengarry bagpipe hat without a diced border and usually with a feather had 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.

History
The history of the Glengarry hat can be traced back to the early 19th century. It was originally a traditional Scottish military cap that became associated with the Scottish Highland regiments. Here is a brief overview of the history of the Glengarry hat:
Origins:
The Glengarry hat was inspired by the traditional bonnets wear by Scottish Highlanders. It evolved from earlier military headgear, such as the bonnet of Tam o’ Shanter and the Kilmarnock bonnet.
Adoption by Highland Regiments:
In the late 18th century, the Glengarry hat start to unofficially worn by various Scottish Highland regiments. It provided a more practical and streamlined alternative to the earlier bonnets, which had feathers or hackles that could be cumbersome during military operations.
Official Recognition:
The Glengarry bonnet was officially recogniz and adopted as part of the military dress uniform by British Army regulations in the early 19th century. It became particularly associated with the Scottish Highland regiments, including the famous Black Watch (Royal Highland Regiment.
Design and Features:
The Glengarry hat is a brimless, boat-shaped cap made of wool or other similar materials. It typically features a checkered band, called a diced band, around the base, often in colors specific to each regiment. The cap is adorn with a toorie (a decorative tuft or pom-pom) at the top, usually made of colored wool. Some versions of the Glengarry may also have a regimental badge or other embellishments.
Military Usage:
The Glengarry hat was primarily wear as part of the military uniform during formal or ceremonial occasions. It symbolized Scottish heritage and military pride. It was commonly wear with the kilt and other elements of Highland dress, creating a distinctive and recognizable ensemble
Modern Usage:
While the Glengarry hat’s military usage has declined over time, it still holds significance in Scottish culture. It has also influence the design of civilian versions, which are wear as a fashion accessory or as part of traditional Scottish attire.
Overall, the Glengarry hat has a rich history deeply rooted in Scottish tradition and military heritage. Its distinctive design and association with Scottish Highland regiments have made it an enduring symbol of Scottish culture.