Janney won the Best Supporting Actress Bafta for her role in "I, Tonya".
Mohapatra, who lives in New York, has previously dressed Michelle Obama, Priyanka Chopra and Celine Dion among others.
The silk velvet column gown that Janney wore has a contrasting ivory cutaway top and sleeves. It is from the designer's fall-winter 2018 runway at New York Fashion Week
Speaking to the Hollywood Reporter, Mohapatra credited his mother for instilling a love for sewing in him.
"I'm shaped by the women in my life; my mother taught me how to sew when I was 14 years old in India. Can you imagine a traditional Indian mother teaching her son how to sew? I'm blessed.
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