The hackle is a clipped featherplume that is attached to a military headdress. In the British Army and the armies of some Commonwealth countries, the hackle is worn by some infantry regiments, especially those designated as fusilier regiments and those with Scottish and Northern Irish origins. The colour of the hackle varies from regiment to regiment. The modern hackle has its origins in a much longer plume, originally referred to by its Scots name, heckle, which was commonly attached to the feather bonnet worn by Highland regiments. The smaller version originated in a regimental emblem adopted by the 42nd Royal Highland Regiment, to be worn in the sun helmet issued in hot-weather postings from the 1870s.
British Army
Hackle colours in British fusilier regiments
Modern fusiliers
In the modern British Army, there is a single regiment of fusiliers, plus a battalion of a large regiment. Hackle colours are:
Following the amalgamation of the regiments of the Scottish Division to form The Royal Regiment of Scotland on 28 March 2006, the following hackles are being worn by the regiment's constituent battalions:
Royal Scots Borderers : Black
Royal Highland Fusiliers : White
Black Watch : Red
The Highlanders : Blue
Argyll and Sutherland Highlanders : Green
52nd Lowland Volunteers : Grey
51st Highland Volunteers : Purple
Whilst the white hackle of 2 SCOTS, red hackle of 3 SCOTS and blue hackle of 4 SCOTS have a known ancestry, the origin of 1 SCOTS black hackle and 5 SCOTS green hackle are not clear and have no apparent precedent. It may be that the black hackle of 1 SCOTS simulates the black-cock tail feathers originally worn in the 1904 pattern Kilmarnock Bonnet and latterly in the regimental Glengarry Cap by the Royal Scots and King's Own Scottish Borderers, who merged in August 2006 to form 1 SCOTS. Alternatively, it may be a sympathetic gesture to a former Lowland regiment, the Cameronians, who went into 'suspended animation' in 1968, who wore a black hackle in their rifle green dress Balmoral. The adoption of the green hackle now being worn by the Argylls battalion is no doubt a continuation of that regiment's association with the colour green, most prominent in the hue of their regimental kilts and stripes on their regimental association ties. The Regimental Band of the Royal Regiment of Scotland does not wear the hackle. However, the Highland Band of the Royal Regiment of Scotland continues to wear the red hackle with the Tam o' Shanter. Tradition holds that the black hackle originated as a Scottish tradition of wearing a black feather in your hat to signify you have an ongoing quarrel with someone.
Other regiments
Former non-fusilier regiments, now amalgamated, which also wore the hackle were:
40 Regiment, Royal Corps of Signals: Navy blue, sky blue and green.
Argyll and Sutherland Highlanders: : White
Argyll and Sutherland Highlanders: Black Cock Feather
Black Watch: Red
The Cameronians : Black
Gordon Highlanders: Feather bonnet only - Drummers and Drum Major: White, Bandsmen: Red and White
Gordon Highlanders: Black Cock Feather
Highland Light Infantry: White over red
The Highlanders : Royal blue
The Highlanders : White
The Highlanders : Eagle feather
Queen's Own Cameron Highlanders: Royal blue
Queen's Own Cameron Highlanders: White
Queen's Own Cameron Highlanders: Eagle feather
Queen's Own Highlanders : Royal blue
Queen's Own Highlanders : White
Queen's Own Highlanders : Eagle feather
Queen's Royal Irish Hussars : White over red
Royal Irish Rangers: Green
Royal Corps of Transport : Red over white over blue
Royal Ulster Rifles: Black
Seaforth Highlanders : White
Seaforth Highlanders Black Cock Feather
No. 9 Commando and No. 11 Commando: Black
Other armies
Australian Army
There are five Army Reserve Regiments with Highland Companies in the Australian Army which wear the hackle: