Theoretically, any jersey would be sufficient or acceptable for a day riding or racing on gravel. However, we typically choose the Ascent Aero long sleeve. It provides extra protection from everything you may encounter (rocks, bugs, grime, sun) but with extremely breathable fabric so you don't overheat. Plus, there's three full-size pockets to load up. Another excellent choice is the Ascent Aero Mesh. It's super breathable, extremely lightweight and has all the support needed to load up the pockets.
The Summit Stratos "12-Hour" Bibs were specifically developed for ultra-endurance events like the Dirty Kanza, one of the world's premiere gravel grinders. They are guaranteed to provide all-day comfort over challenging terrains while being simultaneously lightweight and extremely durable. But, if you're looking for a more compressive fit, you'll want the Summit Raptor. Its tightly-woven fabric provides muscle-soothing support over long miles.