Remember the shoot when RK made Madhu wear a Blue Gown... and Few drops of tears came when he tried to remove the stole...
Why was those tears.. and why no tears now...???
So its not the Dress which made her cry... its the situation...
BLue Gown...

RK planned to send the Heroine and made Madhu wear the gown... well that time also i didn't feel his intention was to insult Madhu in public.. but he want to see her uncomfortable for sure... but for Madhu its the other-way.. RK trapped her to wear the gown and addition to that he tried to take the stol off...
Black Gown...

This time RK gave dress to MAdhu... And she didn't felt bad bcos he gave it as gift... He want to take her to a date.. and Madhu was ready to go with him... why he want to take her and why should she go is another story...
Even if we are fully dressed.. if somebody took out our Dupatta in public.. we will feel bad... Doesn't matter whether the Dupatta is around the neck or drapped on sholder...
After that Blue Gown incident we have seen Madhu crying before the Mirror and she couldn't even finish her prayer... Nobody can say it was fake.. She was hurt to see RK behaving like that to her... And RK.. he himself felt the tears when Madhu was crying... he was shown Guilty too.. he was trying to console her from the other side of the mirror...
Eeven after feeling so bad and sad that time.. MAdhu wore the Black Gown happily this time..
Even after seeing Madhu in tears that time.. RK asked her to wear a Gown again this time...
So I repeat its not the Gown.. its the Situation and the Intention...