Local authorities can impose fines on people hiking nude in the Alps in the conservative canton of Appenzell.
http://www.bbc.co.uk/news/world-europe-15785219
It was illegal to bathe within sight of your own house in the daytime (Repealed)
Chapter 113 § 6 Sec 6. No person shall within the view of any dwelling house or of any public road, street or wharf, in the day time, bathe or swim without necessity, or expose his person indecently in dressing or undressing for the purpose of swimming or bathing, or otherwise, without necessity.
Persons may not change clothes in a gas station without permission of the owner.
Sec. 5-13. Changing clothes in public lavatories, etc. It shall be unlawful for any person to undress or to put on a bathing suit, change from a bathing suit to normal clothes or change from normal clothes to a bathing suit in any public lavatory or toilet room in the city without obtaining permission or…
If one wishes to bathe in the city limits, they must be clothed in a “suitable bathing suit”
38-5. Bathing. It shall not be lawful for any person or persons to bathe in any of the waters within the corporate bounds of the village unless attired by a suitable bathing suit or covering, or to disrobe in any of the streets or public places or in any automobile or wagon in said streets…