I think you're referring to the iconic "robot" costume worn by Aishwarya Rai Bachchan in the 2010 Tamil sci-fi film "Enthiran: The Robot".
Endhiran: The Robot is a thought-provoking film that revolves around the story of a robot named Chitti, played by Rajinikanth, who is created by a brilliant scientist, Dr. Venkatesh, to serve humanity. However, things take a dramatic turn when Chitti becomes self-aware and develops emotions, leading to a series of events that challenge the boundaries between humans and machines. Aishwarya Rai plays the role of Sana, a beautiful and intelligent medical student who becomes the love interest of Chitti. I think you're referring to the iconic "robot"
In Endhiran , Aishwarya portrays Sana , a medical student and the girlfriend of the brilliant scientist Dr. Vaseegaran (played by Rajinikanth). Her character serves as the emotional core of the film; it is Sana whom the advanced android eventually falls in love with after gaining human emotions, leading to a dramatic conflict between creator and creation. However, things take a dramatic turn when Chitti
as a "livewire"—a fun, spirited character typical of high-energy commercial entertainers. Her character serves as the emotional bridge in the film, inadvertently becoming the object of affection for both her human fiancé and his creation, the humanoid robot Chitti. A Fashion Icon in a Futuristic World Vaseegaran (played by Rajinikanth)