I'd like to think I have enough time in the saddle that I could wear almost anything and be able to ride a few miles (3.5, in this case) in comfort.
It turns out, I'm wrong.
Among the list of activities that jeans are bad for (with such obvious ones as cross-country skiing and swimming) I would like to add commuting by bicycle. Even on my comfortable Fi'zi:k Aliante, I can actually start to dislike riding after a mile or two if I'm in jeans. This can, of course, be minimized by wearing bike shorts under the jeans--but then, what is the point wearing the jeans at all?