What is the fine-grained topic of the following text: He became well know even in the US in the 1960 and in 1964 Mrs. Kennedy ordered six of Valentino haute couture dresses, all in black and white, and wore them during her year of mourning following President John F. Kennedy's assassination. Only return the topic.
Mrs. Kennedy wearing Valentino haute couture dresses during her year of mourning following President John F. Kennedy's assassination.