The only thing worse than a woman who smells like she poured an entire bottle of perfume on herself is a guy who smells like he has been marinated in the bottle. At a recent job fair, one employer had a large bowl of unshelled peanuts available. Others offered candy, licorice, or chewing gum, and people were stopping and grabbing handfuls. Before an interview, brush your teeth and gargle. If it's an interview over a meal, avoid foods that will leave you with bad breath or that get caught in your teeth.
Hair can be a sensitive subject for some.
If you are going bald, going gracefully is often preferable to a poorly fitting toupee or other attempts to conceal your scalp. If you feel you must color your hair, get it done professionally. If you wear jewelry, don't overdo it. A few simple and conservative pieces are fine. Chemistry plays an important role in your career transition, but many of us never give it a second thought.