It seems round sunglasses are proliferating as quickly as spring pollen. They're everywhere I look. And it's no wonder: they instantly (and in some cases inexpensively) update any outfit and flatter most face shapes (oblong, square, heart, etc.) I like these cool pairs for $20-$55 from Madewell, Warby Parker (in tortoise) and Asos, and in the $200+ price range from Stella McCartney (similar to above, or in black) and Illesteva.
Photos: Stockholm Street Style, Vanessa Jackman, Harper's Bazaar