It's spring, so ditch the button down shirts and opt for a nautical Breton stripe shirt under that blazer. You can't go wrong with a navy sportcoat, and if it's double-breasted, you get extra street cred and most likely have a tumblr. It's a casual twist on dressing up that is yet to be played out, unlike sportcoats and v-neck T-shirts. Keep things classy with a printed pocket square, and don't forget that you can actually use it to wipe your forehead on especially warm days.
Beams+ Double-Breasted Cotton/Twill Blazer
Buy It Now at Mr. Porter, $640
Topman Blue and White Breton Stripe Sweater
Buy It Now at Topman, $55
The Hill-Side Jacquard Double-Face Bandanna in Green Fair Isle
Buy It Now at Hickorees, $46