Who was a famous designer for young women in the 1960s, specialising in short and highly coloured dresses?

Answer 1

In international designers as per nationality you have the following who had a name in 1960's.
French Designers:
1. Yves Saint Laurent
2. Cristobal Balenciaga
3. Christian Dior
4. Pierre Cardin

American Designer:
1. Carvin Klien
2. Ralph Lauren

English Designers:
1. Gilbey
2. Mary Quaint

Indian Designer:
Although the concept of fashion designers did not come in India till 1980's. Still one designer definately made a mark that is Walter Johnson.

Answer 2

Diane Von Furstenburg and Emilio Pucci (two separate designers, not a team)