At the point where you’re out of undergrad, the responsibilities change even in academia you’re no longer just responsible for yourself. Personality development as a teacher.
graduate students are almost always either part of a research team part of a teaching team or both. How to dress a graduate.
You end up representing a lab a department and you need to be making a good impression.
You probably won’t get thrown out of your program for being sloppy. But if the research isn’t going well or you screw something else up it sure won’t help your case.
Graduates students who teach undergrads need to look dressier than their students.