But a hoodie underneath the coat could possibly look good too...
Congrats, red! I get what you mean as it's a tough thing to navigate in the design industry. You can't appear to be too much of a fashion victim as you're all supposed to be highly original but you're not to look too average either. At the same time, especially since you're an authority of sorts in your new function, you basically have to advertise your own skills in your own aesthetic choices on your body. I think it's always about being on the lookout for things with interesting details or cut. In terms of grooming it seems to be universally less is more, perhaps with one distinctive feature like a sharp hair cut or a thick eyeliner, bare face with the same bold lipsticks, almost like a signature.
The cop out safe version is that sort of semi casual monochrome wardrobe as collaged (by me, saves me from posting loads of pics at once, if individual pics are preferred let me know) in pic 1. I do think it can go a tad ordinary as you really need to invest in good cuts and keeping them in good nick (dry cleaner, often).
Then you sort of have the art curator look in collage 2, that's very sculptural which can be done on the cheap if you've got the time and a frame that carries that well (quite balanced basically).
Collage 3 is another option, it veers a bit younger and plays more with colour and pattern, thus displaying your own skill in this area. I'd imagine if you have access to good charity shops and until you're working perhaps have the time to visit often, you can find quite a lot of these pieces to mix and match with.
I think it's probably also worth considering how you will teach/want to come across. So the third collage feels much 'friendlier', and I'd expect a tutor looking like that to be collaborative and supportive, whilst a lecturer might want the more intimidating aesthetic of collage 2.