Spanx: Poplin Oversized Button Up Shirt in Classic White (21410R) Confeitaria Colombo in Centro, Rio de Janeiro, Brasil Tripomatic. Crisp, clean, and oh so versatilethis Spanx poplin button up is your new closet MVP. The oversized silhouette offers effortless comfort without sacrificing style, while the classic white hue pairs with literally everything. Whether you're dressing it up with tailored trousers or keeping it casual with your favorite jeans, this timeless piece delivers that polished but relaxed vibe we all crave. A wardrobe essential that works as hard as you do.