Elastic or drawstrings are typically threaded through a...

Elastic or drawstrings are typically threaded through a casing, which is a fabric tunnel created specifically for this purpose. A casing is formed by folding over a strip of fabric and stitching along the edges, leaving an opening at one end or both ends where the elastic or drawstring can be inserted. This method allows for easy gathering and securing of fabric, creating a snug fit in areas like waistband slits or around hoods.

The casing provides a clean finish and helps keep the elastic or drawstring hidden from view, contributing to a more polished look in the finished garment. This technique is commonly used in various sewing projects, including activewear, loungewear, and casual apparel, where flexibility and adjustability are desired.