[ hsuBM ]
Desk job, yes.
It's not winter yet so I can't say much more now.
But my strategy is the following: Unfortunately I can't take a shower at work, but if I sweat (e.g. neck or skull) I dry myself off. I often put on a fresh shirt. One of the things that helps – and actually makes sense – is that I try to seal in the heat (from commuting, 45–60 min.) as much as possible by putting on a fitting midweight fleece or something. A scarf also helps. Because that scarf also helps to maintain body heat. In winter sometimes I'll add a hat, if only for my sensitive ears.
I'm not quite sure anymore, but I thought my skinny forearms were particulary cold too. Maybe from sweating there, I'm not sure. Might have a look at that, and wipe those if necessary. I'm thinking of closing the sleeves a bit more in one way or another too and wrist warmers are on my wish list. Another thing I do is to start the workday with a warm coffee or tea.
I think most important of all I have to preserve body heat. Of course I always have to remember not to sweat too much either, to think carefully about my layers.
I'll definitely learn more this winter and will keep you posted.