Is there a professional etiquette regarding jackets in academia? So, I’m sure we all know about the stereotype of the professor in the tweed jacket. Based on a cursory web search, it looks like the stereotype started because tweed was a relatively cheap but warm material, and professors were a relatively poorly paid class of professionals, so they kept wearing them until the elbows wore out and they patched them.

I’m aware that these sorts of things can get a degree of momentum of their own, though, so I was wondering if there was any etiquette in modern academia regarding jackets? I’m a master’s student who is planning on doing a PhD afterwards with the intention of getting into academia; would buying a tweed jacket to try to look professional be viewed as presumptuous or anything?
I don't know if I'd call it an etiquette, but there are certainly different ways to dress in different subfields of disciplines. If you attend an academic conference and notice such things you will see the variety by clique. As for tweed, my partner and I wore it as students (bought second-hand in Edinburgh) and we were mostly viewed as the eccentrics we are, as far as I know. Dressing decently generally shows respect for others, though a few people find it an affront to their class consciousness. Dressing expensively can be seen as distancing from those who can't afford it. The main thing is to be confident that you are presenting yourself as who you really are, so then if there are any concerns you can hopefully laugh them off or explain your dress as a matter of personal taste and/or a concern for general aesthetics.