For women, typically, you’ll wear a special undergarment underneath the kimono, such as a camisole in the summer or a long-sleeved heat-tech garment in colder seasons. If you’re uncomfortable with this, you can also wear a T-shirt over it, but please be aware that the shirt’s collar might be visible. You can also have leggings to wear underneath.
For men, it’s recommended to wear a V-neck or a wide-necked U-neck undergarment. If you’re uncomfortable with this, you can also wear a T-shirt over it, but please be aware that the shirt’s collar might be visible. You can also have leggings to wear underneath.