According to fashion website Net-a-Porter, the top has a row of small buttons down the back, but Kate put hers on with the buttons at the front.
The mother-of-three completed her look with pants from British fashion chain, Jigsaw.
The 37-year-old paid a visit to the centre to learn about their work being done to support young kids and their families.
Kate also revealed that her son, Prince Louis, was "bombing" around on his walker: "Louis just wants to pull himself up all the time. He has got these little walkers and is bombing around in them."
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