There are some events where your stunning Jenny Packham dress just won't cut it. And Kate Middleton obviously knows that a visit to the Scouts Association is far more of a hoodie occasion.
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The Duchess of Cambridge went casual in a black UK Scouting hooded top as she supported the Scout Association's 'Better Prepared' campaign in East London, which aims to help communities to deliver Scouting to two hundred locations across the UK.
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She did, however, manage to get in a posh pair of jeans, donning J Brand numbers with a pair of suede, flat knee-high boots to finish.
Kate, who is five months pregnant, looked very happy to be helping the 23rd Poplar Beaver Scout Colony earn a new disability awareness badge, by helping them understand what's like to live with disabilities.
She promoted disability awareness by helping children to ice a cake while wearing blindfolds - and did the same thing herself.
Kate donned a boxing glove to undertake simple tasks like cutting chocolate to simulate those with mobility or co-ordination problems, and she also learned the Scout Promise in sign language.
Kate was shown around by Carlos Lopez-Plandolit, the Beaver Scout colony leader, who became a volunteer about a year ago.
Speaking to the Daily Mail, he said, "It's the most exciting thing that happened to me in five years.
"Scout groups like the one that the duchess is visiting this evening give young people access to some fantastic opportunities that they might not have access to otherwise."
He added, "As someone who had never considered volunteering with The Scout Association until recently, I can't recommend it enough.
"It's a brilliant experience for those who love adventure and working with young people. Being a volunteer changed my life and I am proud I can change the life of the young people in the community in which I live and work.
"The children had not been told beforehand that the duchess was coming and when she arrived, one older Scout shouted out: 'Oh my God, it's Princess Kate." Aww. Too cute.
LOVE KATE WHEN SHE'S ALL DRESSED UP? See her amazing fashion moments right here: