It's a fine line, really, especially when you're looking at the 1970s.
This finery brought to you by an entire costume and wardrobe department: Bhanu Athaiya (who according to imdb is the first Indian to win an Oscar - for costume design in Gandhi - and was also involved in Lagaan and Swades, among many others) , Shankar Jadhav, Vasant Mahajan, and Mani Rabadi.
Also, take a close look at these sunglasses.
Neat, huh? Prem Chopra and the Big B in 1976? Or Aishwarya and Baby B in 2007? Who can tell?!?