Setup
The background is translucent white acrylic positioned to fill the frame, no more and no less. First capture: A medium continuous-light lamp fitted with a blue gel behind the background is shining toward the subjects and the camera. Second capture: A small continuous-light lamp fitted with a diffuser is lighting the cap from above and the front right to define both the overall shape and the "hills and valleys" of the cap. Two reflectors on the left brightened that side of the cap. The two images were merged.