Last time I went to a festival was 1981 and I’m guessing the styles have moved on since then. 
A quick google shows that I need
Distressed Denim shorts half way up my bum
Floral slip dress
Hunter wellies and long socks
A bum bag worn cross body
Designer sunglassses
Parka
Which is a slight problem. Apart from the fact that I’m in my 50s, I normally dress like a Danish architect. Except for weddings when a wear a Danish architect dress in not black.
For smart casual I wear smart casual Danish architect.
I don’t do casual.
I do however have running clothes in hi vis and hill walking clothes in not black but I’m not sure that helps.
The weather forecast is 🌦🌧 and of course its been 🌧🌧this week so the ground will be wet.
Advice please oh wise fashionistas.