Yeah perhaps another way to tackle this.
Having said that all my siblings are happy to let it be known the sleep nude but all three think I am peculiar because I swim nudes, drive nude, hike nude etc... Because they aren't nudies and don't partake in this kind of nude activity...
Yes because they did not self recognize that they are nudists. What falls into the eye is that it is a journey to become a nudist. I started myself also with naked sleeping and naked yoga. If somebody would have asked me if I am a nudist, I would have said: No I am not! It takes some time to realize what you are doing there. But for statistics it gives us an idea how many nudists are may be there. Of course not all who are nude sleeper or go into a spa become nudists. But it gives us an idea how many are at least interested in nudism (without knowing may be). By the way 12.5 % of the german population (Stern magazine) and 17 % of the US population (Men's journal) are sleeping naked.
I, too, would like to see some hard data on the subject.
There are so many degrees of nudism that the first thing is to define who are nudists, and what sort.
I see the gradations as:
Non-nudist. Is only comfortable when wearing clothes, even sleepwear, although they bathe in the nude in private. They object strenuously to any proposal for sanctioning nudity in any public area.
Nudist-tolerant. Although not nudists themselves, they see no problem with associating with other people in the nude when circumstances warrant it, such as in a communal shower in a gymnasium. If, when hiking, they encounter a nude person, they take no offense. And they are not likely to disapprove when there's a proposal to turn a certain area into a nude beach or nude park.
Nudist. Is more comfortable not wearing clothes when clothes are not necessary. They sleep in the nude, and are likely to be naked in private. Ironically, some of them object to any sort of social nudism.
Social nudist. Is comfortable being nude with other nude people in a social situation such as a party or a visit to a nude beach or park.
Political nudist. Works to create new spaces and contexts for social nudity, creating clubs and resorts and promoting a citizen's right to be nude as much as possible in public areas. Advocates for people to expose their children to nudism and bring them up in a clothes-free culture, and promotes public spaces such as resorts, clubs, parks, and beaches to accommodate nude children while protecting them from people who might do them harm.
Where the percentages fall is anybody's guess at the moment. I would be surprised if less than one person in a thousand falls into the latter two categories.
I'd like to add a gradation to Woodsman 21's gradations:
Equality nudist. Works to create equality and non-discrimination in nudist places and groups, recognizing that nudism is only as strong and sustainable as those who practice it. Seeks to promote nudist environments which are safe and respectful to all, not discriminating by gender, income, sexual orientation, age, abilities, race and creed, etc. Rather the focus is defined by codes of conduct which affirm that all people may be sexual by nature and also have the choice to moderate sexualized and objectifying behaviors. Recognizes that nudism draws a diverse array of people who may seek a correspondingly wide array of events (from parties to World Naked Bike Ride), physical venues (public beaches, spas to resorts) and activities (nude yoga, naked barbers and workouts), etc.
That's a valid point, stoneandy. I would have considered them under the category of "social nudist," with the implication that in their social nudism, they would accept other social nudists as their equal. That's obviously not the case with some social nudists who wish to exclude other people from participation based on some criterion that displeases them, such as being a single male or a male with kids but without the mother present. That wouldn't include those who are there for suspect reasons such as ogling or possibly endangering kids, of course.
I like your definitions. However, in the pursuit of data of any type (and lets face a few of us are interested in this) groupings and definitions need to be simple as most of the population wouldn't read more than a single short sentence to describe perhaps only three or four groups.