White shift dress of Jean Shrimpton
On 1965 Derby Day at Flemington Racecourse in Melbourne, Australia, English model Jean Shrimpton wore a white minidress that sparked controversy and was later described as a pivotal moment in women's fashion. The dress was made by Shrimpton's dressmaker, Colin Rolfe, and its hem was 4 in (10 cm) above the knee because he had not been supplied with enough fabric to complete their intended design.
Source: Wikipedia — White shift dress of Jean Shrimpton (CC BY-SA 4.0)