well I wore a suit, and I got in - and so did the other guys that got in from my recruitment day too... it may have just been a coincidence, but the guys that DIDNT wear a suit didnt get through.... possibly more of a coincidence than anything else - but it gives you something to think about.
When it comes to training, you defnately dont have to wear a suit, nor a tie, but in my personal opinion, at the interview it is your first and only time to portray yourself as a professional person that can be taken seriously in an emergency!
But dont listen to me! hahahha Im not a recruiter! Just going from my successful experience!
M