On November 12, 2014, Sonoko Tagami sued the City of Chicago alleging that section 8-8-080 of the city's municipal code is impermissibly vague, representing an unconstitutional infringement on her First and Fourteenth Amendment rights.
Titled "Indecent Exposure or Dress," the ordinance prohibits women from exposing to public view "any portion of the breast at or below the areola." Women are required to cover their breasts with an "opaque covering." The ordinance does not prohibit men from being topless in public. Tagami was issued a notice of ordinance violation on August 24, 2014 when she was participating in "Go Topless Day," an annual event where women go topless in public to express their view that women, like men, should not be prohibited from appearing bare-chested.