onesie

A onesie is a garment that combines a shirt and pants into a single piece, typically with fasteners at the crotch. This design is often associated with baby clothing, where it is also commonly referred to as a sleeper, sleepsuit, or footie pajamas. The integrated nature of a onesie makes it convenient for keeping babies warm and preventing them from uncovering themselves during sleep. They are usually made of soft, comfortable materials like cotton.

Beyond infant wear, onesies have also gained popularity as casual adult clothing, often made from fleece or other warm fabrics. These adult versions are frequently referred to as "pajama jumpsuits" or "adult onesies" and are worn for comfort and leisure. The term "onesie" itself has become a widely recognized descriptor for this type of all-in-one garment. The fasteners, typically snaps or zippers, are designed for ease of dressing and changing, particularly for babies. The popularity of onesies as both practical baby attire and casual adult wear highlights their versatility and enduring appeal.