The six yard sari must have been extremely on trend in the 30s and 40s (and of course it was also the peak years of the freedom struggle which might have added to it) since it cuts across communities and regions in the country. The sari drape is the same, just presented a little differently with each subculture.
On the left Zvia Epstein’s mother as a young woman, aged 19 (per my original notes, I think the link mistakenly identifies her as Zvia Epstein) in Karachi. From the piece as well as the attire I guess this is late 30s/early 40s.
On the right a young Jewish woman in Bombay, 1948. Its an elegant studio portrait. The blouse and drape reminded me a little of Nargis in Andaz, which suggests it was the style then.