My little boy has a very big head, so the hoods on raincoats never fit him or even stay on, never mind cover his head. I get rain running down my neck when it rains and I'm pushing the buggy, so I thought the solution for both of us is a sou'wester (waterproof hat with a rim all the way round, including at the back). We had them when I was a kid and they were great. Anyone know where I can get them for adults and children?