We couldn't wear white... we need a very potent symbol. I'm not so sure that the RBL would like their poppy used for political purposes, but an equally powerful symbol would do the trick, methinks.
Your right Beatrix, the Poppy would not be appropriate, however.....
Replace the base ball cap with a battle bowler and everyone just happened to have a pick helv, an old metal type dustbin lid (aka NI shield) and an S10 handy....... might make for an 'interesting' day out