One needs to wear a suit when you are going to a job interview.

What happens when you start searching for other jobs while you still are employed and that company has a casual dress policy? You may be causing suspicion. People around you should not know that you are looking for a new job before you have all the details worked out.

Some tips are having change in the car, or if you have a gym membership somewhere near your current workplace, you change at the gym before going on the job interview.