Kate Middleton wore the coat with a pair of black jeans and a black clutch bag to watch a basketball in the US city in December 2014.
Kate and Prince William visited the Brooklyn borough of New York City to watch the Cleveland Cavaliers v Brooklyn Nets.
The pair smiled and laughed as they enjoyed the game with former NBA player Dikembe Mutombo before meeting Lebron James.
The pregnant Duchess of Cambridge visited volunteers and charity workers at the London centre to speak about the important issue of mental health.
The Anna Freud Centre conducts child mental health research and is one of the only places in Britain where children can be psychoanalysed by health professionals.
Kate smiled as she met volunteers and was pictured by the charity involved in discussion with young people.
Kate Middleton: Pregnant Duchess hides baby bump in £400 Tory Burch coat
Kate Middleton: Duchess also wore the coat in Brooklyn in 2014 to watch basketball
Kate Middleton news: Pregnant Duchess hides baby bump in £400 Tory Burch coat
She wore a Tory Burch coat, which the mother-of-two has worn three times before in public.
Kate wore the designer garment when she was pregnant with her daughter Princess Charlotte, two.
The coat is the Tory Burch ‘Bettina’ Grey Tweed Coat, which she wore on a visit to New York in 2014.
It costs $545 or around £400 but is difficult to get hold of online as it is out of production.
Kate Middleton: She wore a Tory Burch coat to visit the London centre
Kate Middleton news: The Anna Freud Centre conducts child mental health research
One of the coats in a size eight is selling for £595 on eBay.
The Anna Freud Centre tweeted yesterday: “We are delighted to welcome our Patron HRH the Duchess of Cambridge to the #HeadStartLearning Conference.
“HRH is a committed champion of children’s mental health and wellbeing and it is fantastic to have her here! @BigLotteryFund @kensingtonRoyal.”
Kensington Palace later tweeted: “The Duchess of Cambridge today attended the @AFNCCF Conference on Improving Young People’s Mental Resilience and Wellbeing.
“This reflects her interest in early intervention in children’s mental health to help young people get support at an early age to prevent problems later on.”