The simplest way to transition bright summer colors into fall? Pair them with subdued neutrals, like charcoal grey. Charcoal grey is a natural shoo-in for me. It's a) my favorite color and b) one of the reasons I'm looking forward to fall. Instead of being overplayed, though, it looks surprisingly modern when paired with a bit of gold sparkle or a rich, buttery yellow. All a light sunshine-hued jacket needs is a warm grey scarf to make it ready for this season.
(photo cred to 1 and 2)