Wimbledon is a real mix(at the races vs tramp life) but you will be boiling in that.
Go for white cream oatmeal or pale blue those were the main colours (for practical reasons)
Also bring ANY hat you can find... you'll want it
I went yesterday i wore a light 2 layered silk dress with wedges i wish I had worn...
My Navy cotton barbour shorts, white uniqlo bratop, blue and white striped cheese cloth / cotton shirt l, comfy Trainers and Straw hat.
Do not underestimate the amount of walking!
I did over 20k and was sat on my arse watching tennis for hours my feet were wrecked