Bars
Hmmmm, this is where the confusion lies...
A lad, younger than some bottles of whiskey I have in my cabinet, came up to me today, and started chatting. I immediately assumed he was an instructor, because he had one bar. Eventually, it became clear he was a CPL student, and so I asked him about the uniform. Turns out it's a schooliform - white shirt, navy jumper, one bar for CPL (and the lad had opted for a tie, too). Not required, but definitely in vogue here (it IS an aeroclub, a large one).
My previous school called them "****** bars"; my current school thinks they're a "confidence-builder" ...
(oooh, it edited my mastabatory reference!)