I was busy packing for an event recently and I looked at the weather forecast. I then went and packed another couple of wool cloaks. If the weather is going to be anything but sunny then it's definately worth packing your good warm wool cloak. There's nothing worse than standing around being cold and wet and while the water will eventually get through the wool it will still keep the wind off and you'll be a lot better happier than the hippy elf traipsing round all bedraggled.
The ones we sell are just the right length so most people can still fight in them in extremis(although I wouldn't recommend it if you have a choice) and are big enough round so you can wrap youself completely up in it. They can also do duty as an extra blanket if the nights are cold.