The woman stripped off her clothes during a hearing at the Board of Supervisors.
The supervisors were taking comments on a proposed public nudity ban.
The San Francisco Chronicle reports the woman let her body make her statement.
She opposes the proposal that would bar letting it all hang out on sidewalks, streets and public transit.
But nakedness at street festivals and parades wouldn't be outlawed.
The woman was led away by a sheriff's deputy.
A few minutes later she got dressed again.