RAF???? Ergonomic/anthropometric measurements for the RAF?

I have sent away my application and waiting to hear back, i have been invited to a presentation evening with them. Should i wear a suit? I am 6 foot 5 and not too sure about the height, i know there isnt a max height but i understand that if i am too tall to fit in the training aircraft then i cant be a pilot ? Is that right? even though to be a helicopter pilot there is more room? Thanks