A classic white or light blue linen shirt is perfect as a beach cover-up, with jeans, or over a silk slip dress. 

Uniqulo has a great one.

Speaking of slip dresses, this one from Quince is the perfect length and style, and looks great with a jean jacket, light sweater, or open button-down. 

These linen pants from J. Crew are everything and perfect with a black tank and jean jacket or a flowing peasant top.

This medium wash jean jacket from Banana Republic goes with absolutely everything and is the perfect layer when the temp cools down in the evenings. 

These cat-eye shades from Warby Parker are fun and classic and will keep your eyes well protected all summer long.

A rattan bag like this one can go from the beach to cocktails in a flash and will never go out of style. We love this one from Madewell.