Kate looks more like she's going to an S&M convention than to the Glastonbury Festival in her PVC leggings. Editorially speaking, I think PVC leggings can look very high-fashion and edgy. But when worn on the streets, or to a music festival in this case, they can look downright scary. What's more, Kate's knee-high boots are way too fancy for a concert where there's clearly mud all over the place.
I would have ditched the PVC leggings and high heel boots and would have worn a more casual ensemble - remember how she made fisherman rubber boots look chic at last year's festival? I would keep the loose black top and pair it with a pair of skinnies and (destructible) flat boots.
How would YOU wear it?