Gathered or elasticized fabric, usually found in clothing like the waist of a skirt or the cuffs of sleeves.
Shirrings are often seen as decorative and can make clothes look pretty or fancy.
Examples:
The shirrings on her dress made it look very pretty.
The shirrings on the sleeves of the shirt made them stretchy.
I like the shirrings on my skirt because they make it fit better.
The shirrings on the dress made it look like a princess dress.
The shirrings on the shirt were so stretchy, they could fit a giant!
The shirrings on the sleeves made them look like a balloon.