I think others have covered, er, the bases pretty well. The only thing I’ll throw out for consideration is the dead bird Atom LT,
only in a vest. I’ve got several of those, and I practically live in them 3 seasons. In winter, I’ll often do a merino zip neck pullover of some sort, with the vest on top for a day of teaching, with various jackets for to and fro. In spring/fall, I often throw one of the vests on over a nice plain t-shirt of various color, with jeans and Allen Edmonds, and go the whole day like that, indoor and out.
I don’t have individual control over the office temp at either school, and it can be a +/-20-degree range in my workspace, depending on the outside weather, and the work orders going into physical services. Despite having the cushiest, indoor sedentary work life imaginable, I’ve found the benefit of technical gear to be indispensable for a long teaching day, since I never know how hot or cold it’ll be.
As an aside, what are the SEALs and GRS types going to wear, now that Arc’teryx and Salomon are both Chinese-owned businesses?