Machine embroidery is often used to embellish baseball caps. The process begins with a digitized design file, which is fed into an embroidery machine. The machine then stitches the design onto the fabric using a needle and thread.

Embroidery machines are computer-controlled and can stitch very intricate designs. They work by moving the fabric under the needle in a specific pattern, following the design file. The needle punctures the fabric and leaves a loop of thread behind, which the machine then ties off.

The thread used for machine embroidery is typically made of polyester or rayon. These materials are strong and colourfast, which is important because the stitching needs to be able to withstand repeated wear and laundering.