Buchanan's Regiment

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Sir George Buchanan, second last chief of Clan Buchanan, was the Colonel of a regiment raised in West Stirlingshire and fought for the de facto Covenanter government against the Royalist armies of Charles 1^st and later against the Parliamentary armies of the Commonwealth. Some of the known engagements were the Battle of Auldearn, 9 May 1645; Battle of Dunbar, 3 September 1650; and Battle of Inverkeithing, 20 July 1651.
I have found very little detail about this regiment. Does anyone know if it was a uniformed unit, and if so was it kilted? If there is no direct evidence to answer my questions, can anyone provide an informed opinion as to what was probably worn by the soldiers and officers of the unit?

Regards,
Steve Buchanan
Sydney, Australia