No such thing as kilts for regular Scots regiments of the period, I'm afraid : the units in Dutch service were clothed by their colonel-proprietor and would wear the exact same apparel as the native Dutch infantrymen - i.e coat, waistcoat, breeches, stockings and either cocked or broad-brimmed hat. The only thing denoting their Scottish identity would be their flags, which invariably displayed the Scottish saltire (usually in white over a blue field, though Murray's colours had a red field), sometimes coupled with golden thistles. This also applied to the Scottish regiments serving in the English army.