While Dongre will design Amala's engagement gown, the bride's wedding reception outfit will be a creation by Mukherjee.
"For the ring engagement ceremony June 7 in Kochi, Amala will be seen in Anita Dongre's white gown. It has been specially ordered for the occasion. On the same evening, she will be seen in a traditional lehenga," a close friend of the family told IANS.
"For the wedding, which is on June 12, Amala will be draped in a traditional Kanchivaram sari and later in the evening during the reception party, she will slip into Sabyasachi's creation and wear a specially ordered diamond necklace to go with it," the friend added.
The engagement ceremony is expected to be attended only by the couple's close knit family, whereas the wedding and reception will be graced by special guests from the southern film industry.
In 2011, Amala and Vijay fell in love on the sets of Tamil drama "Deiva Thirumagal", directed by the latter. Since then they have been dating each other.
Post wedding, Amala is likely to stop acting as she wants to settle down and have a family.
She is currently wrapping up shooting for Malayalam film "Mili", while Vijay is awaiting the release of his latest Tamil directorial "Saivam".