Around 4,000 such saris are woven annually and are distributed among nuns all over the world.
The famous blue-bordered sari of Mother Teresa, who has been canonised as Saint Teresa of Calcutta by the Vatican, has been recognised as an Intellectual Property of the Missionaries of Charity.
"The Trade Marks Registry, Government of India, has granted the registration of the trade mark for that pattern of blue border of sari," Intellectual Property attorney Biswajit Sarkar said.
The diminutive nun of Albanian descent went around the streets of Kolkata since 1948 to be with the poor and the destitutes wearing a white sari with three blue borders, the outer border being wider than the two inner ones.
"The blue border on the sari worn by nuns of Missionaries of Charity was recognised as Intellectual Property for the organisation on September 4, 2016, the day the Mother was canonised," Mr Sarkar told PTI.
"The Missionaries of Charity does not believe in publicity and as such it was not publicised, but since we are witnessing unscrupulous and unfair usage of the design across the globe, we are now trying to spread awareness among people about the trademark," he said.
"The blue border pattern is a distinctive symbolic identity of Missionaries of Charity under the concept of colour trade mark protection," he said.
The exclusive right of use of the said blue pattern on white saris adopted by the Missionaries of Charity is unique and is the first time ever that a uniform has been protected under the Intellectual Property rights, the attorney said.
Born in 1910 at Skopje in Macedonia in a Catholic family and baptised as Agnes Gonxha Bojaxhiu, she came to India in 1929 as Sister Mary Teresa and went to Darjeeling for her novitiate period. She later came to Kolkata and was assigned as a teacher at Saint Mary's High School for Girls before she was given consent by her convent in 1948 to work for the poor.
That year she left the Loreto Convent donning the blue striped white sari that she would wear in public throughout her life. The saris with the three blue stripes are woven at the Missionaries of Charity-run Gandhiji Prem Niwas at Titagarh in North 24 Parganas.
Around 4,000 such saris are woven annually and are distributed among nuns all over the world.