I have both a OR Echo and Tern wool sun hoody. I have used both over mesh baselayers.
It works ok. O haven’t done a multi day spring trip last year, but I might consider bringing a short sleeve Brynje for that.
As a side note, I find the Brynje poly pro to be excellent for smell, on par with merino shirts. I also switched to white. The white is a bit less glaringly “nightclub” look on my white skin the black one.

