First, I start with the first designer of Givenchy, Hubert de Givenchy.When his designs is compared with other designers, like Christian Dior, his designs remained a sense of elegance which was an essence of the fashion at that time yet he developed innovative style.Here are two magazines' covers showing
the style of women at that time. 
And this is a picture of Hubert de Givenchy's design.
From the above picture, you may see the hat as a futuristic piece of art work.
His style was also suggested to be right as he was once the protege of the avantgarde designer Elsa Schiaparelli. Here is one of the shocking piece of cloth of her.
No wonder at that time the application of skeleton structure is an cutting-edge design.She influenced Givenchy's works and innovation should be essential to his designs.Therefore, as time goes by, elegance accompanying with innovation is still the core value of Givenchy.
