Heirloom portraits are framed closely, so the focus is entirely on your child's face. Only the collar and shoulders will be visible in the final image. A simple, classic neckline is all you need. Think Peter Pan collars, delicate ruffles, smocked details, or a crisp white button-down. Soft, natural fabrics like cotton and linen photograph beautifully, and timeless over trendy is always the right call (avoid logos, bold prints, or anything too of-the-moment that might date the portrait years from now).