Sai ka dress is beautiful standalone. It didn't look professional.
All across the world there are certain norms about how people dress up for personal occasions and professional environment.
If they had shown, Sai was at home and had to come in urgently, it would have been fine.
Why it felt more wrong because of the current situation. It depends on how anyone sees it.
But whichever way you see, Sai and V are separated for years... he is married right now. She is working as his subordinate. There is a certain decorum that has to be followed.
Even if she was not planning to woo him, their situation right now doesn't warrant such dressing. It looks like what Sinmegh pointed out... REVENGE!!!
If she was planning to 'show' him what is lost, it is still wrong because he is married and Sai is not planning to break the marriage at all. There is no indication from her side that she wants to do this.
And if it is to show that Sai is not 'actively' doing anything but V is getting affected, then it makes him look shallow.
Going by the history of Ghum, Sai has never worn such dresses when she was legally married to V... the only such dress is the yellow one from Mahabaleshwar which made a comeback in MiMo and later Jags ka assault.
I remember everyone had a discussion then that Sai is always shown covered up in kurtas in their 'good phase' even in the privacy of the room, so why now?
In this context, pink dress didn't look appropriate.
Saree and blouses are still fine because they fall under "formal attire" in Indian professional dress code.
If this dress is to invoke some comment from P and V, then it might be the reason why it was there. 😔 Otherwise it was simply a wrong choice from the costume dept.
No one is blaming Sai/Ayesha.