Wear attire suitable to a business setting, keeping suit, shirt and tie colours neutral. What you might wear to a wedding may not be the best for an interview.
Have you hair clean, neat and well groomed.
The old traditional dress rules still apply (what your Dad or Grandad would say!) e.g. a matching belt and shoes.
You should be cleanly shaved or if you do have a moustache/beard make sure it’s neatly trimmed.