fasten

This word conveys a sense of security and stability, focusing on the act of making something immovable or closed. It is most frequently used in the context of safety equipment, such as seatbelts or harnesses, where the primary goal is prevention of accidental release. In the context of clothing, it describes the mechanical action of closing a gap using a specific tool. While similar to "close," it specifically implies the use of a fastening device like a zipper, button, or clasp rather than simply pulling a fabric over an opening.