The concept of "outerwear" typically refers to clothing items worn to cover and protect the body from the elements. However, if we consider the antonyms of this word, we can explore different types of clothing suitable for indoor activities or occasions. For instance, the antonym of outerwear could be "innerwear," which refers to clothing worn next to the skin, such as underwear or thermal wear. Another antonym is "formalwear," which includes attire such as suits, tuxedos, and evening gowns, worn on formal occasions. A third antonym could be "casualwear," indicating comfortable and relaxed clothing suitable for everyday wear, like t-shirts, jeans, and hoodies.