Re: What to wear for interviews
Unless the letter/email etc confirming the appointment says otherwise, then err on the side of caution and go smart.
It's personal opinion, but for me, I don't see what difference the job is. If you want the job, then make the effort to stand out.
You're going to make a 1st impression one way or the other, so make it a good one. If you're over-dressed, so what, at least you'll be smart.
I'd go with plain and simple suit (black, charcoal, dark grey, navy blue) plain shirt (def top button done up), no whacky ties and socks, dark shoes that are well and truly clean and polished.
Good luck with it.