What tartan are they wearing?

This is a recent photo of the Stornoway based band Peat and Diesel. Does anyone know what their tartan is? I know their accessories leave something to be desired, at least for me, but it's the tartan I'm interested in. They are one of my favorite bands so I had to include a video link to one of their songs.
https://www.youtube.com/watch?v=jbjL-OBP5Ek
Tha mi uabhasach sgith gach latha.
“A man should look as if he has bought his clothes (kilt) with intelligence, put them (it) on with care, and then forgotten all about them (it).” Paraphrased from Hardy Amies
Proud member of the Clans Urquhart and MacKenzie.
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