Umm, just something for you to consider. You are at a military tattoo, it might be an idea not to wear a bonnet with a colour of a significant military connection. Unless you have earned the right to wear a significant coloured bonnet, then might I suggest considering a colour with a non military connection? There will be servicemen and women about who may take a dim view of your colour choice.
Just saying. 
" Rules are for the guidance of wise men and the adherence of idle minds and minor tyrants". Field Marshal Lord Slim.
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