World War II (hereafter referred to as WWII) is a fascinating era in fashion, society, and politics. The fashion of the era was truly representative of the events happening in the world in a most visible way. This era made indelible marks on future designers and the science of fashion as the world knows it. Fashion and costume design were influenced and changed due to the many limitations presented and imposed by WWII. WWII represents a great marker of change socially, technologically, economically, and politically. While it affected the entire world, the main focus of this thesis will explore the effect of WWII on fashion and costume design on the United States and Britain.