Repro/re-enactors ?
Probably
way off the mark but found this on "The Long , Long Trial" website , described as :
Quote:
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From the war diary of the General Staff at the headquarters of 36th (Ulster) Division. Crown copyright. National Archives WO95/2491. May 1917. The sleeve ‘battle patches’ worn by the division’s infantry battalions.
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https://www.longlongtrail.co.uk/army...ster-division/
.