it's clearly a fly plaid. I also see a tropical white tunic and what looks like North American architecture in the background.
What does that have to do with the price of tea in China? British Army bands frequently tour the US and Canada.

If you look at the D/M's baldric you will see HM the Queen's Royal Cypher and a regimental badge of the old Royal Irish Regiment, similar to the one pictured here:

http://www.army.mod.uk/images/image-.../concert6c.jpg

Regards,

Todd