Illinois law
RE: Illinois law
https://naturistaction.org/AlertsAdvisoriesUpdates/ALERTS/Illinois_HB_5874_06-15-02/illinois_hb_5874_06-15-02.html
Here is a link that may answer your question after some reading. It looks at first glance as yes it is illeagal but I think each county may be able to write their own version. try googling your county for public nudity laws.
Hope this helps.
I know there are numerous clubs in Illinois.
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