As noted in this answer, the typical well-know-from-paintings red coats and hats uniform of Russian Streltsy guard was both a winter and summer uniform.
Is there any reason why an (obviously warm, to survive Russian winter) clothing was also used as summer uniform? It must have strongly reduced the military efficacy of the troops, who'd be sweltering in Moscow heat in summer in the same cloths required to survive Moscow winter.
Was it cost? Rarity of uniform clothing pre-textile-industry? Logistic issues? Or the fact that the uniform wasn't actually all that warm and winter warmth was instead achieved by layers of cloths worn under the red coats?
