They were fastened at the lower leg, below the knee, by a garter (the precursor to the flashes of the Highland Dress) as can be seen in the painting by David Morier of the Battle of Culloden.
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For example, the 91st Highland Regt of Foot wore trews during the Walcheren campaign of 1809 and more famously, the 93rd Highland Regiment of Foot wore trews and round unfeathered Highland bonnets during the war of 1812–1815 against the USA, when taking part in the British campaign to capture New Orleans in January 1815 and during the disastrous Battle of Chalmette Plain itself (lithographs of the battle wrongly depict them wearing kilts).
The personnel were based at Greendyke Street drill hall near Glasgow Green and were distinctive because they continued to wear their kilts in contrast to the rest of the HLI, who wore trews.
The festival features mostly alternative music and has hosted such groups such as Sydney, Alexisonfire, A Northern Chorus, Billy Talent, Boys Night Out, Cauterize, City and Colour, Ligeia, Crush Luther, Del tha Funkee Homosapien, Johnny Truant, Lights, Magneta Lane, Raising the Fawn, The Trews, and The Black Lungs.