For the meeting with the CP,
No tie, still an ironed set of trousers but not to the razor edges, and a neat ironed shirt (something neat, and casual you might wear to meet the girlfriends parents etc), keep it nice and casual, keep the CP thinking your nice and relaxed, just a get to know kind of thing from the sounds of it.
I'd be listening to Hoss at the same time, he seems to know the goings on around there, but I'd still be keeping a very formal interview for the interview and a slightly less formal for the CP, but hey thats just me.