It's a lot easier if you're in the midwest to go jacketless in 40-ish degree weather. I remember being at the Office Convention in Scranton in just a couple T-shirts and jeans and feeling fine. Somebody asked me if I was cold and I said "I'm from Cincinnati, this is NOTHING" It was about 40-ish degrees, but I wasn't cold at all. I was fine. If the sun is shining and the wind isn't blowing, people would wear no jackets in 30 degree temps, so it's not THAT big of a deal. Daniel