interesting one this, obviously an issue for roadies, as team kit is very prevalent.
i'm a footy fan (sorry) but would NEVER wear a team shirt myself – many obviously do.
but on my road bike…. i dunno. I have club shirts to wear in events, and a couple of Rock Racing team shirts (sorry again) but trying to think if i've any other "team" kit – don't think so. Defo wouldn't wear Postal/Disco/Astana etc, but might wear Euskadi, dunno, talking bollox now.
But to the OP, the TdF coloured jerseys are a no no (esp polka dot in my case !)
Having just said all that, I've a disco maglia rosa, but it IS signed by Salvodelli. Worn it twice.
G.