Waistband (noun)

1. A band or a strip of material that encircles the waist of a garment, such as a skirt, pants, or shorts.
2. A band of material that encircles the waist of a person and is used to fasten or hold up a garment.

Origin:

Middle english waistband, from waist + band.

Examples:

1. She adjusted the waistband of her pants.
2. The waistband of the dress was too tight.
3. He wore a belt to keep his pants up, but the waistband was still loose.
4. The waistband of the skirt was elastic, so it fit her perfectly.
5. The waistband on the shorts was too tight, so he had to wear them a little lower.