Kate, Princess of Wales and Prince William, both 41, attended the Out-Sourcing Inc. Royal Charity Polo Cup on Thursday.
The Princess of Wales supported her husband who partook in the game, by cheering him on from the sidelines.
Kate wore a £550 Beulah London “Sonia” Blouson Sleeve Cornflower Dress for the occasion, which was pale blue and white.
Body language expert Darren Stanton, on behalf of Betfair Slots, spoke to Express.co.uk about this dress choice and what it symbolised.
He said: “This is a real switch for Kate. We have never seen her wear this type of dress before. It’s very light and summery, it’s a switch from her normal colours.
“This reflects that she’s feeling relaxed and carefree. We can see lots of positive smiles from her. She is genuinely happy to be out and about at the event.”
The expert explained what the Prince of Wales wore and why he was “in his element”.
Darren opined: “William was of course wearing his polo uniform, which was nice to see. He looked very happy to be there, he was in his element.
“It took him back to his youth. He had a massive beam across his face. It was great for Kate and William to have a day of fun with each other.
“They were able to be themselves and properly let their hair down. It’s nice to see her and William so relaxed with each other, despite being at a work engagement.
“They’re on duty but you can tell they’re a bit more calm and enjoying themselves. They’re in high spirits and interacting with each other on a good level and everyone else.
“They’re both very authentic with everyone they come across, wherever they are. They’re always true to themselves.”
Darren noticed a change in Kate’s body language when she was with her husband, Prince William.
He suggested: “Kate does seem to be more confident than William with owning the room, and she’s very tactile with him.
“She was seen touching his arm and his elbow, and William reciprocated that as he didn’t hold back from being affectionate, but respectful with her in public.
“The pair kissed each other’s cheeks, with Kate giving William’s arm a cheeky squeeze. The way they mirror each other perfectly shows how real their connection is.
“They couldn’t be any closer together. Kate’s hands are in the exact same position as William’s, and you can feel how happy they feel by looking at them together.
“Kate’s smile as William kissed her on the cheek was a complete passion from her side. He makes her light up. The arm squeeze is also very telling of their relationship.
“You don’t let just anyone hug you or hold you like that. Hugs like that are from those who know you inside and out.”
According to the body language expert, Kate and William have a “deep connection”. Darren claimed: “We also saw Kate and William holding hands, with their fingers interlocked and that was an example of matching each other’s gestures.
“It’s clear they are on the same level and have a deep connection with one another. Later on, Kate put both of her hands on her cheeks while letting out a huge smile, which was a really nice moment caught in time. It shows she has genuine joy and pride, she couldn’t be happier.”