I got these 2 raincoats from barking mad clothing (http://www.barkingmadclothing.co.uk/). They arrived yesterday and they are so cute! Its been raining here all day but has now stopped so they haven't had a chance to wear them yet. They have other really nice coats and sweaters too.
They are quite light so can be used all year round and also have a flap at the top for a leash.