On the day of Fadinard's wedding, his horse eats a lady's hat on a bush at the roadside, while the lady is hidden behind the bush with her lover Lieutenant Tavernier. Because she is married, she cannot return home hatless without being compromised, and Tavernier orders Fadinard to replace the hat with one exactly like it - or else he will wreck his new home. In an elaborate sequence of complications, Fadinard tries to find a hat while keeping to his marriage schedule
