A woman in a white bridal dress and ruby red shoes, carrying a white umbrella, stands atop a platform while handing a brochure to a middle-aged female passerby.
The woman is modeling a wedding dress.
A lady in wedding dress can attend a wedding not necessarily be modeling.
A woman does not need to be modeling a wedding dress in order to wear one.
Just because a woman in a white bridal dress and ruby red shoes, carrying a white umbrella, stands atop a platform while handing a brochure to a middle-aged female passerby doesn't mean she is modeling a wedding dress.