The Best Fabric Fiber for Travel: WOOL

Wool is wonderful! it is a natural fiber, cut and processed from the sheep’s lush shearling. Modern methods include prewash and softening, to ensure comfort for the skin, and the wearer. Wool is the only fiber that keeps warm when it is moist. It is perfect to use in changing weather and during demanding activities.. If you sweat, you will still feel comfortable. 
I always bring a light, rib-knit slip on all travels. all my underwears is in nude colour. The slip is perfect under a shirt or blouse, as it will take the edge of the cold draft you sometimes experience on flights, and when you get into an air-conditioned room. Then it can double as nightwear. If you sweat in wool, it will not smell as bad as synthetics, and dry much faster than cotton. Wool can be handwashed with shampoo. Squize out the water, roll it in a towel and let it dry flat.