What items may I bring on the tour?

Sunglasses could be a good idea for the flight deck, if it's sunny. A jacket would be good especially during winter, it can get windy up there.

comfortable clothes and shoes

Sunglasses, a jacket during the winter or on cloudy days, confortable shoes as you are going to walk a lot and, of course, a good camera to take really nice pictures.

A jacket also in the afternoon starts to make some cold air

And sunscreen or a hat ir cap if it's sunny