Well, I prefer "boxer briefs" and khaki. A century in those? Hmmm.... well, lots of metric centuries in that kind of gear last summer... but for a full English century in that kind of gear, I think we have to go back to summer '08. I think I wore bike shorts on all my centuries last year. I try to dress more or less like the other people I'll be riding with.
As for your dare... I will take you up on that! What's the prize?
Abrasions and humilation? I'm with khatful...I should have been more clear, I wear baggy mtn style cycling shorts WITH Lycra UNDER sweat pants during anything 20 miles plus (weather dependant). I'll usually wear a sausage skin under the T-shirt or knit if it's not just a commute,