It looks like a leather version of a Navy pea coat or watch coat. Something like this one, except
leatherhttp://images.google.com/imgres?imgurl=http://www.theblackbuoy.com/__data/3b0fd1e864915abe96a0d14645dabcfd.jpg&imgrefurl=http://www.theblackbuoy.com/item/pea-coat---tan&usg=__cmmVPhmXjQ_VXCP8iJn86WPvhC0=&h=496&w=456&sz=40&hl=en&start=3&um=1&itbs=1&tbnid=5aeQixUXvqLfmM:&tbnh=130&tbnw=120&prev=/images%3Fq%3Dleather%2Bpea%2Bcoat%2Bfor%2Bmen%26ndsp%3D20%26hl%3Den%26sa%3DN%26um%3D1
They usually come with a zip out liner, which Doyle didn't use.