On their second official royal outing together, the couple were greeted by large crowds when they visited the Reprezent radio station in Brixton which was set up in 2008 as part of a response to a rise in knife crime among young people.
The radio station, housed inside shipping containers in the south London district, is supported by the charitable foundation of Prince Harry, his brother Prince William and his wife, Duchess Kate of Cambridge.
"Struggling high street giant Marks & Spencer was quick to react on Markle's choice of knitwear, tweeting: "#MagicandMarkle - Meghan wears our Autograph Bell Sleeve jumper on her trip to #Brixton". "I can see why your show is so popular".
'It really was most thoughtful of you and greatly appreciated. "I must tune in".
Meghan Markle meets members of the public following a visit to youth-orientated radio station Reprezent FM in Brixton Dominic Lipinski PA Wire
The prince and his fiancee visited community station Reprezent FM, which provides media training and experience to young people.
The organisation's CEO Shane Carey welcomed the visit saying: "We're having the spotlight shone on us from all the world's media".
Meghan Markle has closed all her social media accounts almost four months before her May wedding to Prince Harry.
Harry, 33, and Markle, 36, will marry at Windsor's St George's Chapel on May 19. Brand Finance's chief executive David Haigh recently said: "We think approximately £200 million will come from tourism, travel, and hotels".More news: Justin Timberlake bringing 'Man of the Woods' tour to Columbus