I just got back from a trip to Europe (Englad, France, Holland, Belgium, Germany and Austria).
Tons of bikes on the roads (especially in London!!!). Not ONCE did I see any rider in less than boots, helmet and Leather jacket. Most (i would honestly say more than 90 % had on full leathers). We took the ferry from London to Calais, France and back and there were about 50 or so bikes on the ship each time with the cars and buses. Each rider that I saw walking around the ferry on both trips had on full suits with racing boots and were carrying their helmets. Definitely a different mind-set in Europe when it comes to riding.
Here, people would definitely stare if I wore what they wore. But, even though its 90+ almost everyday, it doesn't stop me from wearing my Sidi Airs, Helmet and Vanson perf EVERY time i go out. Even to the Blockbuster 1/4 mile away.