Allow me to introduce you to the coolest brand on Instagram: Posse. A-listers such as Sofia Richie and Selena Gomez are fans and with good reason — the label offers classic styles in airy fabrics. Whether it’s a crisp linen two-piece set or a summery minimalist dress like mine above, the Australia-based fashion line has become a favorite for those who love an elevated, less-is-more approach to dressing, especially as the quiet luxury trend continues to reign.