Animals don't wear clothes. We learnt it from early childhood. At three years old, you could keep asking why your cat didn't wear "some clothes" . You could even get a scientific answer: "animals don’t wear clothes because, for the most part, they are still restricted to climates where they don’t need them" . If you are a little older, you may begin to ask yourself whether taking off clothes brings a man or a woman closer to an animal or even "crosses border" between a human being and an animal.
Once Jacques Derrida , a French philosopher, found himself frontally naked "faced with cat's eyes looking" at him "from head to toe" . He started thinking about "the property unique to animals, what in the last instance distinguishes them from man, is their being naked without knowing it". The philosopher continued, "naked without knowing it, animals would not be, in truth, naked. They wouldn't be naked because they are naked. In principle, with the exception of man, no animal has ever thought to dress itself". It appears that clothing "would be proper to man, one of the "properties" of man". "There is no nudity "in nature". Then new questions arose: "Before the cat that looks at me naked, would I be ashamed like an animal that no longer has the sense of nudity? Or on the contrary, like a man who retains the sense of his nudity?" 
Leaving all these childish and philosophical questions aside, we can specify what indeed "distinguishes humans from other animals" . The answer lies in the sphere of mind and it is not restricted to awareness of nudity. According to modern scientific studies,"mounting evidence indicates that, in contrast to Darwin's theory of a continuity of mind between humans and other species, a profound gap separates our intellect from the animal kind".
Abraham Maslow , an American psychologist, introduced the notion of peak experience, "the most wonderful experience or experiences of your life; happiest moments, ecstatic moments, moments of rapture, perhaps from being in love, or from listening to music or suddenly "being hit" by a book or a painting, or from some great creative moment" . Peak experiences can be described "as moments of maximum psychological functioning", when a person "feels more intelligent, more perceptive, wittier, stronger, or more graceful than at other times" [7,8].
Maslow considered "the taboos on nudity to be entirely a matter of folkways and customs rather than a matter of ethical or moral principle in any cross-cultural sense" . He "had an established but purely theoretical interest in whether nudity would make people in therapy "an awful lot freer, a lot more spontaneous, less guarded" .
In the late 1960s, basing, in part, on Maslow’s ideas about peak experiences, it was supposed that nudism can be "a viable path to personal growth, authenticity and transcendence". The therapy called nude psychotherapy was developed. The naked body was considered "as a metaphor of the "psychological soul". "Uninhibited exhibition of the nude body revealed that which was most fundamental, truthful, and real" [8,10-12]. "Although nude therapy has an indisputable tabloid character, it is also rooted in a long-standing academic search for authenticity and ultimate meaning through science" .
Despite the controversy concerning nude therapy, it gives an insight that nudity does not interfere, but rather helps to realize the human potential.
The post can also be found on Vadimage Blog
 Clare Painter, Learning Through Language in Early Childhood, A&C Black, 2005
 Question: why don't other animals wear clothes?
 Jacques Derrida - Wikipedia, the free encyclopedia
 Jacques Derrida, The Animal That Therefore I Am, Fordham Univ Press, 2009
, see also Critical Inquiry, Vol. 28, No. 2 (Winter, 2002), pp. 369-418
 What Distinguishes Humans from Other Animals?
 Abraham Maslow - Wikipedia, the free encyclopedia
 Abraham H. Maslow, Toward a Psychology of Being, Start Publishing, 2013
 Margarita Tartakovsky, The History of Nude Psychotherapy – World of Psychology
 Jessica Lynn Grogan, A Cultural History of the Humanistic Psychology Movement in America, ProQuest, 2008
 Nude psychotherapy and the quest for inner peace – Mind Hacks
 Ian Nicholson, Baring the soul: Paul Bindrim, Abraham Maslow and ‘Nude psychotherapy’, Journal of the History of the Behavioral Sciences, Volume 43, Issue 4, pages 337–359, 2007
 Nude psychotherapy - Wikipedia, the free encyclopedia