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.