Why the blue stripes on a rank slide?

#1
Bone question i know, but two people have asked me this week and i didn't know the answer.

I thought it was just a way of PRI shops making a few quid. I should have told them some kack about 'you can only wear blue stripes if you've swam the channel'.

I'm asking on behalf of "a friend" you realise.
 

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