Thanks for the recommendation, I'll check out the Rogelli site. I shop Cambria often as they're relatively close, but haven't seen any long pants or long sleeves for kids there so far. With a 22' waist and 6.5' biceps, he can't wear women's sizes yet except for gloves. You're right that he's only up to 1.5 hour rides so far, but our goal is to double that by the end of Spring. Temps here can vary by 10 degrees in a couple of hours if you're in the right part of day.
For now, I ordered him some long pants (which we will still have to take in the waist), and a wind shell that he should be able to pack into his jersey pocket.
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It's like riding a bicycle