In Canada, s.173 of the Criminal Code  prohibits "indecent acts". There is no statutory definition in the Code of what constitutes an indecent act (other than that the exposure of the genitals for a sexual purpose to anyone under 16 years of age), so the decision of what state of undress is "indecent", and thereby unlawful, is left to judges to decide.
In Canada, s.173 of the Criminal Code  prohibits "indecent acts". There is no statutory definition in the Code of what constitutes an indecent act (other than that the exposure of the genitals for a sexual purpose to anyone under 16 years of age), so the determination of what state of undress is "indecent", and therefore unlawful, rests with judges.