Technically, here in the UK, is it not specifically illegal to be naked. The recent Sexual Offences Act was modified (after lobbying from naturists) to be specific that without intent to cause distress, nudity of itself is not a sexual offence; nevertheless, the police and the legal system often continue to behave as if it were. Even if nudity is non-sexual, various general public order offences are used against anyone who refuses to immediately cover up, on the grounds of disorderly conduct which might causes distress. Worse, any complaint about nudity, even if vague and not referring to a specific incident, can justify action against other nudity however discreet. Public opinion is not a consideration, a single complaint from a prude trumps all. Why is this? There are always those who consider themselves guardians of the national morals, believing that the masses, if not kept under control, would collapse into turpitude. But the job of the police is to enforce the law, not to make it.