you will want to be immaculately groomed, leaving no visual distractions. so your posture, and ability to communicate will be commanding the attention.
what to wear if not a "Suit" , - it's really hard to fail at wearing tweed. in colder weather, brown cords and a tweed with brown shoes will come across as well put together, but not trying too hard.
Sorry Size 38R, but while your grooming advice is fine, your clothing advice - as usual - is not. I love tweed and I have it in all forms, but tweed is not interview material. Neither is cord. Unless you are going for a job as a gamekeeper... While you are telling the OP to avoid 'visual distractions', which is great, you've followed this by outlining about the most non-standard, i.e. visually distracting, interview outfit possible. Your (rather random) suggestions of members to look for don't really work either, however much you or I may like the way they dress, because they all dress rather differently and certainly not for a conventional business interview context.
To the OP, it's really very simple - unless you are going for a job in some kind of creative field - as others have already said:
1. Navy or grey suit;
2. Light blue or white shirt with a collar that fits you;
3. Sober (read: boring) tie;
4. Socks the same colour as the suit;
4. Dark brown or black shoes, polished.
You do not want to mess about with trying to appear anything other than professional in interviews.