When I was in my mid twenties I would show up for an interview in a suit with a fresh haircut and a shave. I'd have a copy of my resume and a personalized cover letter.
Now that I'm in my mid thirties I show up to an interview wearing a T-shirt, with scruffy hair and a poorly managed beard-disaster, closed-toed shoes optional. Then I'm like "Be honest, will I hate working here?"