Hear me out:

Sport coats. (edit: and blazers)

Very light linen ones for hot days, which keep sun off your skin without really making you hotter. Cooler days, break out the wool.

All those extra pockets are wonderful. Grab some thin old mass-market genre paperbacks and discover why they made them that size :-)

They're like purses for men, that you can wear instead of carry, and that make you look better. Similar storage capacity to a fanny pack, I'd say. Maybe a little more.

Yes, my teenagers were shocked and appalled when they saw it, and made me promise I would only wear it while on the bike.