Corrected entry: When Peter Pettigrew transforms himself into a rat and escapes, he leaves behind his clothes. In all Harry Potter films, including Prisoner of Azkaban, an Animagus is able to transform back and forth fully clothed.
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Correction: This is not entirely correct. In Philosopher's Stone, Professor Magonagall turns from an unclothed cat into a woman. Same with Sirius Black in POA. Peter Pettigrew would only obtain his clothing upon changing into a man, not vice versa. Leaving his clothes behind wouldn't necessarily matter, as new clothes would, of course, magically reappear when he transforms back into human form.
Macalou