What is a onesie?

A onesie is a one-piece clothing item that covers the body from the neck to the feet. It is typically made of soft and comfortable materials such as cotton, fleece, or flannel. Onesies usually have a front zipper or buttons to make it easy to put on and take off. They are often worn as loungewear or sleepwear, but they can also be used as a costume or a fun outfit for events such as festivals or parties. Onesies come in a variety of designs and colors, including animal prints, cartoon characters, and patterns. They are popular among adults and children alike.