What to wear oasis concert

[Facing40andfrazzled]

What should I wear (size 14 ..5 foot 1 1/2 inch tall) to oasis concert, we will be in a corporate box with a smart casual dress code so not sure if baggy trousers and a band tee would be acceptable

I was in the corporate box for a concert last summer, there was the whole gamut of attire, from jeans to suits, shorts to floaty dresses. I wore a very average summer dress (from Next) with a denim jacket and trainers.