Oversize button-ups have proven tried-and-true in the street style game, but a new piece is stepping in and taking over. Our latest obsession: The easy and sophisticated shirting tunic. A perfect canvas for a variety of looks, the crisp separate has proven to be a must-buy style for the transition from summer to fall. Whether you layer it up or dress it down, the tunic’s modern simplicity will nail a sexy-yet-polished look (just add chic accessories). Ahead, see how we’re styling this coveted staple and shop our picks to stock up now.