In the WSS, grey or white grey (unbleached wool) was used by a number of armies, French, Austrians, Dutch etc which could make identification of friend and foe quite difficult. Quite a few armies sported units with red coats, including the Spanish and French (Irish in Foreign service and Swiss) not just England and Denmark.. A unit's colours might not always be visible or clearly identifiable so additional field signs were not uncommon. Whilst regimental colours tended to be made of silk, even silk requires a breeze for it to fly.