I got the shirt in an X.L, my jacket size is 48L. I took it out for a spring run, where the temperature was not too cold. it kept me adequately warm and even when I was sweating, it did not feel as heavy as most of my other 100% cotton shirts the color is a true black and though I haven't washed it yet, I have confidence in adidas as a brand that it will not fade drastically

Size is true, no need to go up or down from normal.