It was cool enough (with wind chill factor) that us skinny guys were comfy in a sweatshirt or windbreaker. Well, I'm not so skinny, but I am hypoglycemic...low blood sugar. Rodney is dieting, so he's low on heating fuel, too. Neither Pete has skipped a meal in awhile...thus, T-shirts were fine for them. It's the time of year when you need to be prepared for hot or cold. I suggest always, always, always, taking a polar fleece jacket if you're going to be outside, any time of year, in the NW. My favorite is Cabela's "3 Season" coat, nylon exterior, polar fleece lining. The NW Skyraider's jacket is similar (Mike Haverly was wearing his in the picture).
I didn't take my own advice for the contest at Chehelis in September, and regretted it a little. For the Prairie Fire Stunt Contest in Edmonton, Alberta, I've always taken polar fleece jacket and a Filson hat, and always found them useful in early August...also shorts, because it can be as hot as Texas! On the way home one year, it was 110 deg. F. in Kamloops, BC. I had the AC on and about fell on my face when I got out to buy gas...er, petrol....eh! Big distances, too, so you have to watch the gas gauge and plan a bit. Bring several credit cards. Mine got blocked as I was trying to leave Eddie. Shoulda notified Visa that I was going someplace, apparently.
I would have been in deep sewage, without a backup card.

Steve