I made a midlayer top out of some polartech powerstretch with a snug fitting hood (like for under a climbing helmet) thumbholes on the sleeves, and hidden hand warmer pockets above the level of a hipbelt or harness. I was going to use the Green Pepper Polar Hoodie pattern, but when I got it and did some sanity check measurements on it, it had really, really weird dimensions. Snug hood and baggy body. I would recommend avoiding that pattern.
I ended up making my own pattern in a CAD program. I can send you the pattern if you want ideas, although it is customized for my body dimensions (I'm 5'9" and ~160lbs).
I do really like the powerstretch fabric for midlayer or warm baselayer. Easy to work with, warm, comfy and stretchy.
And yes, I liked the outcome :)