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Motorcyclist here.
Sweat is less of a concern for me, so cotton makes an easy to care for baselayer. Size xlt, so bodega shirts in the summer--long tees in the winter. Port and company hawks decent ones for $10 on Amazon.
Mid is a high-necked bulky knit sweater. At 85mph, simply undoing my collar is like a 5° difference. Denim jeans are plenty thick for flying gravel.
Outside, I actually have three jackets that rotate by weather. Teflon, leather, and waxed cotton.
All are water resistant, but if I'm expecting deluge I pair the Teflon ADV jacket with matching pants. The pants also have both knee and hip pads, for increased crash risk.
Seasonally, I move from mesh to leather to goretex gloves. With liners as a permanent option. I also keep a scarf and coffee in my bag, for double layering and to manipulate my baseline temperature.
I only camp in spring and summer. Post office is too busy from school season to Christmas. Broadcloth shirt, linen if you can afford. Durable trousers, denim minimum. Shorts not briefs, to prevent chafing. Wool sweater. Real. Wool socks.
I'd like wool for a jacket too, but for summer my cotton does fine. Waxed like your mother's cornhole. Wool felt fedora. Unironically the most functional hat I've ever owned.
All of these things can be washed in a stream. All of them can be alternated with a single other set. The sweater, hat and socks will keep you warm if you fall in and it's all soaked. A properly fitting coat and sweater will serve any temperature needs.
Liquor instead of coffee, because it's pretty good cold.
