Social nudity in Seattle is an umbrella reference for Seattle 's culture of non-sexualized clothing-optional and topfree events. While Seattle is known for its naked cyclists, the history of clothing-optional activity in Seattle includes nude and topfree use of areas of Magnuson Park , Washington Park Arboretum , Discovery Park , and Denny-Blaine Park. Body Freedom Collaborative is a nonprofit organization dedicated to advancing the integration and acceptance of non-sexual social nudity in a variety of public and private settings, and was formed in the early s by Mark Storey and Daniel Johnson. RCW 9A. The act of breastfeeding or expressing breast milk is not indecent exposure.