Living as I do, a stone's throw from Winchester, the spiritual home of the red trouser, I see a lot of men sporting the look. They are ALL wankers.
Please tell me you don't team them with deck shoes, a Gant shirt, and a jumper draped over your shoulders?
One for sorrow
Two for joy
Three for a girl
Four for a boy
Its from an old story that sighting a pair of magpies (or more) heralded a new arrival.
Of course it dates from a time when seeing them was far more unusual, as they were freely shot at and killed as pests.