With reference to the GP about awkward people, if an adult hiring manager is intimidated by an professional applicant wearing a suit to an interview in good faith (after all, it's widely seen as mark of taking the interview seriously), I think it is perhaps not the applicant who need to learn the social skills.

If an interviewer can't tell the difference between a flex and show of good intent, they probably should go back to jobs where they don't need to make judgements of character.