I'm sorry, Jock, but I couldn't find any Irish Guards photos with them wearing the Caubeen. They're usually photographed wearing the bearskin. On the other hand there are loads of photos of the Royal Irish Rangers (see link) who wear theirs with the badge over the left eye and the excess cloth pulled over to the wearers right.
http://www.royalirishrangers.co.uk/uniform.html
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