Much as I admire Grant Peterson of Rivendell, I don't take everything he says as gospel.
I wear what is comfortable for
me. And, I find lycra cycling shorts to be comfortable, so I wear them. I wear wool tops, armwarmers, and legwarmers when it's cold out, but when it warms up, I switch to regular cycling jerseys, generally sleeveless.
Grant had a column in the Rivendell Reader a short time ago where he challenged riders to do a ride without gloves or sunglasses. Sorry, Grant darlin', I'll keep wearing my gloves because they keep my hands comfy and will hopefully keep them from getting cut up if I ever fall (and they come so in handy when my nose is running). And since I wear contacts, I'll almost always wear either sunglasses or clear lenses.
It's easy to recognize Grant toodling up Mt. Diablo. He'll usually be wearing a floppy brimmed hat, seersucker shirt, baggy shorts, and Converse All-Star sneakers. And he'll be going faster than about 90% of the folks climbing that freakin' hill
Anyhoo, all that I'm saying is, wear seersucker if that's what you want to wear. Wear lycra if that's what you want to wear. Simple, eh?