Poplin Oversized Button-Up Shirt in Classic White

At Baseline Social, we’re obsessed with pieces that make getting dressed feel effortless — and the SPANX Poplin Oversized Button-Up Shirt is exactly that. Made from premium Supima® cotton with a luxe super-fine yarn count, this lightweight poplin shirt delivers the perfect mix of polished, breathable, and ridiculously comfortable. It’s the elevated basic your athleisure wardrobe has been waiting for.

The oversized fit, pleated back detail, and high-low hem give that effortlessly put-together look whether you’re headed to tennis, golf, pickleball, brunch, or just powering through a busy day looking cute while doing it. Tucked or untucked, this machine washable button-up pairs perfectly with leggings, trousers, skorts, and all your sporty-chic favorites.

Crisp, versatile, and easy to wear year-round, this SPANX button-up shirt is the definition of luxury athleisure style. From court-side mornings to casual nights out, Baseline Social brings you elevated women’s fashion that keeps up with your lifestyle — and looks good doing it.