Social/environmental attributes dat at-least-adequately allow for da willingness to shed one's garments.
Exactly what would be considered "bareable conditions" would vary widely among different people, of course, but generally they would involve things like how well da considering-stripping-off individual likes/trusts any accompanying humans who would be observing said person in his/her "birthday suit", what will likely be expected of him to allow/perform with relation to said accompanying humans, how warm and isolated da present surroundings are, etc.