Och aye, man! Battle Flag have produced a set of transfers to use on the tartan kilts of Victrix Napoleonic highlanders. The decal set also includes the bonnet and sock dicing, along with the pack and water-bottle numbers, for the 92nd Gordon Highlanders.
What an excellent idea!
http://wargametransfers.blogspot.com/2011/09/28mm-scale-tartan-for-wargame.html
DRESSING THE LINES 