Sage green and true white is quiet and clean, the green warmed just enough to keep the white from going clinical. The pique polo has a textured knit with a bit of structure, so it holds shape through a long day of sitting and walking. Think a summer trip, walking a new city in the heat, phone out for directions. Light colors read cooler in the sun, which is the whole point when it's 90 out.
Finish with white leather sneakers, a woven tan belt, and a brimmed cap.