If rain is expected, full-kit wanker goretex
Lovely boots
Replica shirt (one of 60 odd, carefully chosen for the occasion)
Phone
Lactose tablets in case I fancy a half time walk on the wildside
Snout, and associated paraphanalia
Some form of ingress (latterly the phone has it)
In recent times, genuine excitement and an expectation of Good Times
An empty bowel (can't be too careful)
A can of Sanpellegrino for the journey home
And I like to show a bit of respect by ensuring my hair is nice, my beard is nicely trimmed, the eyebrows are nice, and the ears and nostrils are nicely depilated
Showered, and a little spray of something nice, and aaahm reddeh!