Yes! Wear a suit. In any situation you can always take off the blazer. If it happens to be business casual, go to the restroom and lose the tie. Funny story. I went to a regional interview about 10 years ago. I was patiently waiting as other interviewees were coming in to the waiting area. Everyone is in black suits with black ties, 1 or 2 renegade red ties. A uniform row of shined up softly tapping shoes. Then one of my former flight instructing colleagues walks in wearing a purple shirt with a purple tie and no jacket. He has red hair. He sat down and said "obviously I didn't get the memo" with a hint of nervousness. I felt really bad for him. He still got the job.