Under-clothing refers to clothing that is worn underneath the outer layers, such as underwear and undershirts. However, there are several synonyms for this word, including undergarments, intimates, lingerie, base layers, and foundation garments. Each of these terms describes a specific type of under-clothing, such as underwear for both men and women, bras and panties for women, and undershirts and long johns for men. Lingerie often refers to more decorative or embellished under-clothing, while base layers and foundation garments are typically made of materials that provide warmth or support. Regardless of the synonym used, under-clothing plays a vital role in providing comfort, protection, and support for the body.