Perhaps the first thing that needs to be defined is the idea of fellowship. In a Christian context it is more than just hanging out and having a good time. In many ways a Christian fellowship group that meets for spiritual reasons is meeting to gain the benefits of nakedness without being naked. The attempt is spiritual transparency involving openness, equality, vulnerability, etc. that is a part of nudity to begin with but in a spiritual sense. Most of the time Christian fellowship is about spiritual nakedness without being naked physically.
A typical Christian fellowship group is about doing these things by having people open up on a far deeper level than just normal relationships get. God is brought into the equation either through prayer or Bible study. Sometimes both are attempted, but most of the time the group will gravitate to one or the other. To intensify the fellowship aspects you either have to have a time of questions about a persons spirituality (in a prayer group) or organize your Bible study questions in such a way that each person gets to reflect on the meaning of the passage for themselves. If there is not this Spiritual questioning of self in the context of community; in my opinion, it degenerates into just another social club.
The best fellowship groups with this type of accountability in history were created and operated by John Wesley and the Methodists. The deep questioning and prayer were both there and the class meetings were much the same. John Wesley realized that he needed to strip away the defensive veneer people put up and get to the core of the person. He is in reality the creator of support groups but in a purely spiritual context. In his context though, nudity would not have been possible given the culture of his day, so I think he made the questions deliberately harder to get past these outer defenses.
Nudity as part of a fellowship group discipline would create a symbolic and actual vulnerability and openness physically that would be present spiritually in time. It brings up communal nudity as a group reflective opportunity that could lead to that more open spiritual state that could lead to greater fellowship. The real question would be about spiritual maturity or simple familiarity with being nude in front of others without it being a distraction or an ego trip.
In reading naturists and nudists, they all speak of loving communing both with their fellow nudists/naturists as well as nature in this way, but often they speak about how they don’t feel naked spirituality in a group context is possible. In this area, I think many of them are missing the opportunity to both understand and practice spiritual fellowship because they don’t perceive of what they are doing as spiritual and they are seeing it as purely a social or emotional experience. There is a reason the Scriptures encourage gathering together of believers and that is the discipline of fellowship. In this one case, I actually think nudists and naturalists might have something to learn from Christians that do not practice nudity as a discipline.
Next: Naked Confession