Nakedize

It was alleged, moreover, that the practive of stripping young persons sometimes is eminently conducive to their health, to strength of body, symmetry, beauty, and to morality, and virtue ; and that even grown persons may derive much benefit from remaining some hours, in mild weather, without their clothes. It was most manifest that the children liked to nakedize—such was the term of art—exceedingly; but it was something new and different from the ordinary routine of jackets, trowsers, and petticoats; — in a word, it was a change.

Source: wiktionary

For several hours during the day they were stripped and made to nakedize that their bodies might receive the benison of nature's light and air. The parents, too, nakedized in the privacy of their rooms.

Source: wiktionary

They were allowed to "nakedize" as a privilege on a theory of "philosophic nakedness".

Source: wiktionary