There are so many Indian fashion designers like Manish malhotra , Ritu Kumar, Savyasachi Mukharjee and so many on. Just you have to go on their official website and order the lehanga.
You can also have a look at amazon,flipkart, myntra and nynka,ajio etc. People also go for famous designers like rithu kumar too. Buy always that fits you and the light coloured one with heavy works on it.
You can get the latest designer Indian wedding lehenga at various retailers, including Sabyasachi, Manish Malhotra, Anita Dongre, Tarun Tahiliani, and Manyavar Mohey.