actually I must admit I did have polkadot jersey once but I was the QoM with my little group. there isn't really anything wrong with wearing team colors or a WC colors but... I would never show up a group ride with WC or current team jersey. I have seen USCF officials make riders turn their jersey inside out before the start of a race.
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“One morning you wake up, the girl is gone, the bikes are gone, all that's left behind is a pair of old tires and a tube of tubular glue, all squeezed out"
Sugar "Kane" Kowalczyk