Hello. I purchased the long sleeve skinsuit in a large. I am 6’-2” 190 lbs. and typically wear a large in race fit cycling gear. After riding with them, I find the sizing larger than typical for a large. Some of this could be due to the weight of the fabric which may stretch more than others that are lighter. I found the chamois to be thinner than I am used to and the sides cut into the inside of my legs. Overall, the quality of the design and assembly are good. I would imagine that a medium could work for me as it would fit tighter and the chamois may be narrower. I also think a lighter upper fabric would help the fit be more predictable especially once the fabric is wet from sweating.
Thanks, Eric