Under coats are an essential part of any winter wardrobe, providing an extra layer of warmth beneath a coat or jacket. However, there are many other words that can be used to describe these garments. Some popular synonyms include base layers, thermal tops, long johns, or simply thermals. These terms often refer to more form-fitting garments that are designed to be worn close to the skin. Other options might include fleece jackets, sweaters, or cardigans, all of which can be layered underneath a heavier coat to provide additional warmth. Whatever terminology you choose, a good under layer is vital for staying comfortable and cozy in colder temperatures.