What is another word for union suit?
Pronunciation: [jˈuːni͡ən sˈuːt] (IPA) 
A union suit is a one-piece undergarment that covers the torso and the legs. Although this accessory has been around for centuries, it has undergone certain changes, especially in terms of its design and name. Some of the synonyms for the term "union suit" include "long johns," "thermal underwear," and "long underwear," which are often made of wool, cotton, or a blend of both. Other synonyms include "onesie," "bodysuit," and "romper," which typically come in a variety of materials, styles, and colors. No matter the name or fabric though, the essential function remains the same: keeping the wearer warm and cozy throughout the day.
