Wedding in a field on Saturday - shoe and coat help!

[MushroomTree]

One of my friends is getting married in a field on Saturday and I need help with shoes and a coverup/coat.

We've been advised to wear flat shoes and although the weather is meant to be ok I'd still rather have a coverup or coat in the car in case I get cold.

Cheap would be good! My dress is either brown and pink or navy - I haven't decided yet!

Can you link to the dresses you're deciding between? Or describe them?

Also, what do you look like and what size are you?

What do you mean by "cheap"? And which shops can you get to, given the short timescale?

wedges good on grass, patent wipes clean, avoid suede, consider wellies