Interview outfit dilemma

[WipsGlitter]

i have a job interview this week. It's for an internal post, nut I have never met the interviewers as they work in a different part of the country. I will be working in their office all day of the interview. Generally our office wear is pretty casual (smart jeans acceptable). I have a prada suit I generally wear for interviews but I will look very, very over-dressed in the office that day. I was thinking about getting a new dress and wearing that, maybe with the suit jacket?? Or should I just wear the suit?

Wear the suit.

Do you have to hide the fact that you're going for an interview?

Either wear the suit or you could buy a dress with matching jacket and wear that and take the jacket off when you arent doing the interview.
If you wear the Prada suit you could take the jacket off for most of the day so you would just be in trousers and top?

I'm just a bit self conscious that I will turn up in the other office and be sitting there all day. They will probably guess I'm there for an interview although I've only told my line manager (who also works in this office). It's a skirt suit so I could take the jacket off and put it on when it's time for the interview.