This is the only quote I have found about spirituality and naturism so far from anyone with any religious qualifications.
"Physical actions or outer attributes aren’t effective. You may be completely naked, as is written about Adam in the Garden of Eden, or you may wear a Monomakh's Cap (this is the crown of Russian grand princes and tsars) or any other hat. If something happens to a body, how is it related to a soul, how does it affect it? It’s clear that it doesn’t."
Source: Worlds formost Kabbalist, Michael Laitman, at http://files.kabbalahmedia.info/files/eng_t_CongressOdessa_Lesson-1_ML_Hofesh_bchira_2005-10-21.doc