Five months into her pregnancy
and just back from a Caribbean "babymoon"
in Mustique, the Duchess of Cambridge
is stepping up her work as she returns to her royal duties.
Kate, 31, is set for a visit to the port of Grimsby, about 180 miles from London in north eastern England, where she will be shown the local work of one of her father-in-law Prince Charles's best known charities, the Prince's Trust.
On the March 5 "away day," she will also see a local school and take in a history lesson on the local fishing industry when she tours the town's museum.
With the fashion-conscious princess also thinking about her maternity wear, she's reportedly turned to friends Natasha Rufus Isaacs and Lavinia Brennan at Beulah London for some frocks, it was reported Monday – though the company did not wish to comment.
On Tuesday of this week, Kate will return to public work by visiting a treatment center run by one of her charities, Action on Addiction
, a women's-only project in Clapham, London.
"These women would have chosen to have some time out of the company of men and they need to focus on themselves," charity chief executive Nick Barton tells PEOPLE. "This is more about the longer term, helping people sustain their recovery and think about the things that makes them vulnerable to relapse."
Royal aides tell PEOPLE that Kate is set to pick some new patronages in the coming weeks, to add to the several she adopted in January 2012.
As it is, the non-profit group 100 Women in Hedge Funds – already associated
with Prince William
– has announced it will partner with Action on Addiction for Kate's first year of her patronage.