Saris in the 1920s on either side of the subcontinent 1) A Parsi family in 1925 Karachi and 2) A Calcutta Cup Race where “horses take second place to fashion” (from the film Calcutta Topical No 1-1925) . The pallu is worn over the head so often in this decade. Also still a lot of blouse. The sari drape – pic 1 is Parsi, pic 2 the version adapted in Bengal -varies, otherwise the look is similar.
Do follow link 2 and check out the pic for Delhi Extract -1938 for Delhi fashion of the time.