Duchess Kate makes a casual return to royal duty in an olive green ensemble

By Jessica Pollack

Duchess Kate is back in action following a six-month maternity leave after welcoming her third child with Prince William, five-month-old Prince Louis. The royal stepped out on Tuesday (Oct. 2) for a cause close to her heart, the mental health and wellbeing of children, visiting the Sayers Croft Forest School and Wildlife Garden in London. Kate was dressed appropriately for the fun, hands-on outing, which saw her gardening with a gaggle of adorable kids while dressed in a casual chic olive green ensemble.

GALLERY: Duchess Kate's best casual looks

The duchess wore a casual look for a visit to garden with children. Photo: © Chris Jackson/Getty Images

The Duchess of Cambridge dusted off her favourite brown Penelope Chilvers boots and slipped into Zara motorcycle jeans (which we've seen before in India!) with a cozy sweater (and Joseph Rainer blouse underneath) and a green Fjallraven jacket as she took part in fun green-fingered activities with the children. She accessorized with a pair of Monica Vinader earrings. Looking her ever-elegant self, Kate wore her hair in soft waves with pretty highlights framing her face, plus a swipe of blush, some mascara and pink lipstick, as she chatted with all the children at the school and planted pea seeds. She also toured the Paddington Recreation Ground, which includes an edible garden area. The organization uses these kinds of pursuits to nurture the physical and emotional wellbeing of inner-city children who don't have lots of access to green spaces.

Kate wore a similarly chic dressed-down ensemble last year when she visited the Robin Hood Primary School, which boasts a similar gardening program. Pregnant with Prince Louis at the time, the future queen paired a waxed jacket with dark jeans, a cable-knit sweater and the same brown boots. "I've got such fond memories of being in the garden and being outside from my own childhood, and I'm sharing that with my own children, George and Charlotte, at the moment," she said at the time.

The mother of three seems to have gotten in plenty of bonding time with her brood this summer, from outdoor play at their country home, Anmer Hall, to sweet snapshots on the sidelines at a polo match with George, 5, and Charlotte, 3, where Kate was clad in a pretty blue and white Zara shirt dress. But there were also a few unofficial royal outings where the duchess was dressed to the nines, from her cream Alexander McQueen dress and oversized headband at Prince Louis' christening to some sisterly bonding in the stands at Wimbledon with Meghan Markle, both in July, plus a recycled blue ensemble and floral headband at her close friend's Norfolk nuptials in September.

We most recently saw the duchess dressed to impress at her friend's wedding. Photo: © Mark Stewart Photography Ltd

Fans can expect to see Kate step out in style on two very exciting occasions this fall - Princess Eugenie's royal wedding to Jack Brooksbank on Oct. 12 and the state visit of King Willem-Alexander and Queen Maxima of the Netherlands at the end of October.

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