Tshirt, Jacket, belt and hat provided, as well as a money belt. You have to wear dark coloured shoes, and wear your trousers. Which cannot be jeans or joggers, have to be work trousers.
There was very limited questions when I went, it was basically just filling out the form to sign me up.
All that was asked was what days I could work, what kind of ours i'd be expecting to work etc.