Fly Plaid at Burns Supper?

[Janner52]

I see men attending themed "Dickens Balls" or "Victorian Balls", where everyone not in Highland Dress is wearing period costume, wearing 20th century Highland outfits, especially Prince Charlies (which didn't appear until the Edwardian period), the sorts of sporrans that didn't appear until after WWI, and the white hose + Viking-laced Ghillies, or "semi dress" sporrans, both Kilt Hire c1980 things. (Even the gent wearing the red military doublet seen below is anachronistic for a Dickens event; that style of doublet and sporran didn't exist until around 1870.)

The photo of the man wearing the military doublet troubles me somewhat. He is clearly wearing his chevrons on the wrong arm. Right arm only in that uniform. His sash and medals are correctly worn so it is not a mirror image. His friend clearly got dressed in the dark.
Hope I am not offending anyone but I do wish people would seek help when wearing unfamiliar attire.