Look up Morvelo’s overland shirt if you’re OK with the flannel shirt look. It’s a really thin stretch softshell that looks like a shirt. Long slim cut (very long arms) and great pockets at the kidneys. Love mine. I was waiting to see if they brought out some other colours and would have picked up another for sure (plain black or dark grey would be a winner) but it’s not on their website any more so might be discontinued.
Weatherproofing is good but breathability isn’t great - I guess you can’t have both. If you try to force your breath through the fabric you can get little bit through. Could you say how the RF Conspiracy compares in the same test?