The Very Informal Dress (S02E08)

Larry Tate invites Samantha and Darrin to a buffet for prospective client Charles Barlow. When they complain about the condition of their clothes, Aunt Clara uses magic to produce a dress for Samantha and a new suit for Darrin, who invites her along to the affair. Once there, Aunt Clara removes a fire hydrant so Darrin can park. At the party, Samantha's dress begins to vanish and Aunt Clara's other magical efforts begin to disintegrate. (iTunes)