Easy, Breezy Button-Down
All the colors of the rainbow

Celine Sunglasses, Vintage Earrings (similar here), Rails Shirt, Madewell Skirt, Fendi Mules (similar here, affordable version here), Clare V. Bag (black version here, similar here)
Usually button-downs feel so serious, but this one, with its vintage-esque, worn-in rainbow pattern is unlike others in my closet. I love the slightly oversized, slouchy feel since anything too clingy is the opposite of what I want when it's stifling outside. It's also super soft—I liken it to sheets you've slept in for years that are perfectly worn-in—which makes for the ideal thing to tuck into a simple denim skirt. I kept the rest of my outfit playful, with a straw bag and floral mules, for a quick lunch out with friends.