Fans found Kangana wearing Alia's wedding dress and how!

Fans are going crazy over Ranbir and Alia's wedding details. They recognized Alia's wedding dress back when Kangana Ranaut wore it and question why the this happened. I think it is yet to confirm if the Lehenga was a Sabyasachi or a Manish Malhotra but do you think it is nice of fans to inspect such details?