The academic profession has competing demands and the people who are there in this field need to look knowledgeable and trustworthy. To add to this as a professor you need to also appear approachable to your students. A lot of people are of the opinion that it does not matter what an academician is wearing and they should be rather assessed on their performance as a teacher more than anything else. I beg to differ here and propagate a completely different opinion to this. I have always firmly believed that aesthetics should be fundamental to humans and all of us humans assess others on the basis of how they present themselves.
To go a bit more in detail, what can we ask from our clothes to reflect as an academician? Essentially other than potentially acting as a talking point, the dress that an academician wears has to reflect authority, knowledge and also a professional personality. How much one focusses on that is an individual perspective though.
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It is ok to dress for fun and enjoy your otherwise mundane routine as long as you ensure what you wear helps to make your journey simpler and easier in ways more than one.