1. A drawstring refers to a device made of a cord or strap that can be tightened or loosened. It typically consists of a cord or strap connected at two ends, allowing for adjustment of length and tightness by pulling the two ends.

2. In clothing, a drawstring is a common design element used to adjust the looseness or secure the waist of garments. It is often found in styles such as pants, shorts, hoodies, jackets, and more.

3. There are numerous examples of drawstrings, including:

   - Waist drawstring in pants: By tightening or loosening the waist drawstring, the fit and comfort of pants can be adjusted to provide a better fit.

   - Neck drawstring in hoodies: By adjusting the tightness of the neck drawstring, the size and shape of the hoodie's neckline can be altered to suit individual preferences and styles.

   - Bottom drawstring in jackets: By adjusting the tightness of the bottom drawstring, the hem of a jacket can be cinched or loosened to prevent cold air from entering or provide better mobility.

4. The history of drawstrings can be traced back to ancient times, although the exact origins are not clear. They were initially used in military gear and outdoor equipment to adjust tightness and secure positions. Over time, drawstrings evolved as a practical design element and found application in clothing and other fields. Today, drawstrings have become a combination of fashion and functionality, widely used in clothing design to offer improved comfort and personalized adjustments for the wearer.