The Glengarry bonnet is a traditional Scots cap made of thick-milled woollen material, decorated with a toorie 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 or Tam o' Shanter.
[1] 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 designed in 1934 for the Cavalry Corps as a more practical headdress than the standard peaked cap in the confines of their armoured cars and tanks.
Army pipers and drummers wear a black Glengarry with a saffron band and ribbons and a dark green feather hackle.
This new feature was a black and white chequered cap band based on the dicings seen on the Glengarry headdress of the Scottish regiments.
The diced band, popularly known as the Sillitoe tartan, later spread to police forces in Australia, New Zealand, and the rest of the United Kingdom, as well as to some other parts of the world, notably Chicago.