Never worn in any club I have been part of and personally would never wear any pro team kit, it's a traditional thing. As for Championship jerseys [polka dot etc] and most especially the rainbow stripes, never. These have been earned and should only be worn by those who are world champions, they are worn with tremendous pride and have respect from all other riders, for others to wear them is to show disrespect to the world champions, a bit like wearing a medal for combat / bravery you never took part in.
On the other hand we do enjoy the hilarious sight of overweight blokes in various tops including the polka dot jersey puffing their way up shallow inclines .
Sounds like you and your pals would have a good chuckle at me then. Occasionally wear my Sky top and certainly struggle up some inclines. I'm sure it makes you feel everso good!