Nudism

Nudism, also known as Adamitism, is the act of being completely naked while performing non-sexual activities either alone or in a social setting. The act may also be referred to as Naturism, however, while the two terms are broadly interchangeable, "Nudism" emphasizes the practice of nudity, whereas "Naturism" highlights an attitude favouring harmony with nature and respect for the environment, into which that practice is integrated.

Individuals practise nudism across the world in various ways for various reasons; some practise nudism privately (only going naked while within their private residence or while sleeping) while others practise it publicly/socially with other people; either in same-gender or mix-gender groups. While for some Nudism is a personal preference due to individual taste, others may practise it for physical and mental health benefits or due to the practise being a part of their culture.

Trivia

 * Nudism has been practiced since ancient times by various cultures but the word was first coined by a Belgian named Jean Baptiste Luc Planchon.
 * Many Liminals have different morals and levels of shame than humans, so it's normal for them to change their clothes in front of others. However, as Kimihito notes, they often don't realize the discomfort they can cause to others, particularly others of another sex.
 * Some Liminals have very different cultural standards about wearing clothes. In the case of Shapeshifters like Doppel, it is normal for them to be naked, while in turn they are totally embarrassed to wear clothes and Slimes on the other hand, usually go nude because garments tend to hinder their movements.