I'm getting married on Saturday in a very low-key informal event. I'm wearing this dress with some tan sandals.
It's going to be freezing and wet on the day and we're taking public transport 
What can I wear on top of the dress to keep me warmish and dryish?
I don't suit macs usually (makes my boobs look like two giant flat squashed things), which is annoying. I thought something like this Fearne Cotton Ditsy print mac might just be OK but it's out of stock in my size (10)
Only have tomorrow to go and buy something - can I have your ideas/suggestions?