There are a number of solid merino companies out there these days, but I'm not sure many of them are BIFL-appropriate (YMMV).

Pendleton is a good, affordable recommendation. I'd also advise checking out Filson and Dehen 1920 for high quality, heritage-tier wool. I have a shawl sweater coat from Dehen that I've been practically living in & have received multiple compliments (on zoom & from strangers irl); goes well with business casual.

If you're just sitting & not moving all day, you may want to consider some thick wool socks & wearing a beanie / hat in between meetings.

When in doubt, supplement with a lap cat ;)