Quote Originally Posted by Archangel
Could the confusion come from the wrap-around kilt aprons like on the cover of Osprey's Scottish Units? I believe the London Scottish marching postcard shows a similar full apron cover.

The Ghurkas were attached to Scottish units in WW1, my grand-dad's for example. Tartan patch probably came from that. (My guess.)
Several of the Gurkha regiments have actually adopted tartan for pipe bags, plaids, etc. -- the 10th Princess Mary's Gurkhas wore Stewart Hunting, and the modern Royal Gurkha Rifles wear the Douglas tartan. Most of this was due to regimental associations; the 2nd Gurkhas, for instance, maintained an association with the Gordons, since both served on the Northwest Frontier and fought at the Battle of Daragai where Piper Findlater won the VC.

This web site contains a detailed list of regimental tartans:

http://www.regiments.org/tradition/tartansx.htm

Cheers,

Todd