What would you do with a British Army coat?

I have an old British Army coat (Royal Highlanders, the Black Watch to be specific) which I got for £40 in a charity shop. It's just languishing on a coat hook because I have no idea what to do with it.

How would you use it? What would you pair it with? Doesn't have to be regular wear, could be a costume or something.

Thanks in advance!

https://imgur.com/a/KaPqdUx