Girl In His Pocket (1957)

aka’s: Nude In His Pocket/Un Amour De Poche

A professor (Jean Marais) experimenting in suspended animation accidentally shrinks his dog and later his female lab assistant (Geneviève Page), when she drinks a liquid by accident and shrinks to 3 inches tall. The professor keeps her in his pocket until he can find an antidote. Sometimes she’s naked too! Also stars Jean-Claude Brialy.