The gaping button-down is the ultimate villain in big boobs fashion. You have three solutions.
Solution A: The Sewing Kit Buy a shirt that fits your bust (usually a size or two up). Sew a small, hidden snap or a hook-and-eye clasp between the two problem buttons (usually the third and fourth from the top). Keep the outer button for aesthetics.
Solution B: The Safety Pin (Temporary) Run a small safety pin inside the shirt through the placket (the folded fabric edge) so it is invisible from the outside. The gaping button-down is the ultimate villain in
Solution C: Stretch Fabrics Forget 100% cotton poplin. Look for shirting with elastane (2-5% spandex). Brands like Bravissimo, Pepperberry, or any "curvy fit" label add extra length to the placket and darts in the side seam.
Solution D: The Bandeau Layering Wear a matching or black bandeau under the open shirt. Leave the top three buttons undone, but tuck the shirt into high-waisted pants. Suddenly, gaping becomes "intentional layering." Sew a small, hidden snap or a hook-and-eye
Empire waists are dangerous (they cut across the middle of the bust and look like a maternity top). However, a seam that hits directly under the bust—the inframammary fold—is magical. It separates the bust from the torso, providing definition.
Since you searched for "content," let's assume you are creating for this audience. Whether you are a YouTuber, Instagram Reel creator, or blogger, here is the content map that goes viral. Solution C: Stretch Fabrics Forget 100% cotton poplin
Empire waistlines (the seam directly under the bust) are dangerous. They turn your chest into a "shelf" and make you look pregnant if you have any tummy at all.
Conversely, low-cut tops are often the only off-the-rack option that fits. Because standard V-necks allow room for the bust, many women feel forced into hyper-sexualized necklines simply to avoid the dreaded armpit squeeze of a crew neck.
The Golden Rule of Big Boobs Fashion: Fit the largest part of your body (your bust), then tailor the rest. Do not size down to fit your waist. Do not size up to fit your chest. Buy for the boobs; alter for the belly.