Also, one might add khakis were invented by a British soldier serving in India who got rid of his wool uniform for something more comfortable in that climate.
About 25 years ago I was invited to a CSA re-enactment wedding as the chaplain. The wedding was outdoors, in central Florida in early July, with the temperature and humidity both in the mid-90s, and I was required to wear a full uniform, 100% wool. I get you could say it was the wursted I ever got. The Raj would never have lasted into the 1940s in wool.