Originally posted by: sherry_24
1. Karishma and Sai are very young, so to depict the age difference they are probably made to wear suits while Pakhi wears sarees
2. Karishma is not a maharashtrian, hence she calls Sai and Pakhi as Bhabhi. Sai had heard about Pakhi from Virat even before her marriage, and she suspected their past. Hence she had started addressing her as didi. Also if u notice in CN she is the only other person apart from Virat who calls her Pakhi. Because that’s how used to refer to her before marriage.
Good observation.. may be she considers Pakhi as her husband's friend, more than her sasural..