Samantha turns fashion icon
There is a formula which every director follows. Irrespective of how glamorous a heroine is in real life, people will notice only how glamorous she will be shown by a director. So, it's director's duty to take care of that. And there is duty for heroine too.
For example take the case of Samantha. In many movies she is playing characters that are really middle-class in nature. So she is seen in simple dresses. Those dress types are affordable for all middle class girls out there. But whenever Sam comes out into public, she transforms herself into a fashion icon. From wearing dresses designed by world-class fashion designers to flaunting her glamorous attitude, she set certain standards. That's quintessential for any heroine to make her mark on tinsel town, say experts.
Though a heroine plays a simple role through out the movie, in songs she will be carrying the film forward with her glamour treat. If people has to remember as glam-icon then her looks at any public event should no less than that. Bollywood heroines are good at following this while Tollywood has fewer starlets like Samantha, Taapsee and Shruti Haasan doing that.