Kate Middleton wears a green Sandro dress and espadrilles for garden picnic

Kate Middleton’s latest look proves that summer has officially arrived.

Today, the Duchess of Cambridge, 37, hosted a garden picnic in honor of the “Back to Nature Garden” she helped co-design.

Middleton wore a green short-sleeve dress by Parisian fashion brand Sandro, which featured a V-neck and pleated waist band. Although it normally retails for $370, the dress is currently on sale for $222 (aka 40 percent off).

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Duchess Kate hosts garden picnic
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Duchess Kate hosts garden picnic
LONDON, ENGLAND - JULY 01: Catherine, Duchess of Cambridge visits The RHS Back to Nature Garden she designed at the 2019 RHS Hampton Court Palace Flower Show at Hampton Court Palace on July 1, 2019 in London, England. (Photo by Mark Cuthbert/UK Press via Getty Images)
LONDON, ENGLAND - JULY 01: Catherine, Duchess of Cambridge visits the Hampton Court Flower Festival with children from Hampton Hill junior school at Hampton Court Palace on July 1, 2019 in London, England. The Duchess visits her Back to Nature Garden at Hampton Court Palace Garden Festival that she co designed with Andrée Davies and Adam White (Photo by Heathcliff O'Malley - WPA Pool/Getty Images)
LONDON, ENGLAND - JULY 01: Catherine, Duchess of Cambridge visits the Hampton Court Flower Festival with children from Hampton Hill junior school at Hampton Court Palace on July 1, 2019 in London, England. The Duchess visits her Back to Nature Garden at Hampton Court Palace Garden Festival that she co designed with Andrée Davies and Adam White (Photo by Heathcliff O'Malley - WPA Pool/Getty Images)
LONDON, ENGLAND - JULY 01: Catherine, Duchess of Cambridge visits the Hampton Court Flower Festival with children from Hampton Hill junior school at Hampton Court Palace on July 1, 2019 in London, England. The Duchess visits her Back to Nature Garden at Hampton Court Palace Garden Festival that she co designed with Andrée Davies and Adam White (Photo by Heathcliff O'Malley - WPA Pool/Getty Images)
LONDON, ENGLAND - JULY 01: Catherine, Duchess of Cambridge visits the Hampton Court Flower Festival with children from Hampton Hill junior school at Hampton Court Palace on July 1, 2019 in London, England. The Duchess visits her Back to Nature Garden at Hampton Court Palace Garden Festival that she co designed with Andrée Davies and Adam White (Photo by Heathcliff O'Malley - WPA Pool/Getty Images)
LONDON, ENGLAND - JULY 01: Catherine, Duchess of Cambridge visits the Hampton Court Flower Festival with children from Hampton Hill junior school at Hampton Court Palace on July 1, 2019 in London, England. The Duchess visits her Back to Nature Garden at Hampton Court Palace Garden Festival that she co designed with Andrée Davies and Adam White (Photo by Heathcliff O'Malley - WPA Pool/Getty Images)
LONDON, ENGLAND - JULY 01: Catherine, Duchess of Cambridge visits the Hampton Court Flower Festival with children from Hampton Hill junior school at Hampton Court Palace on July 1, 2019 in London, England. The Duchess visits her Back to Nature Garden at Hampton Court Palace Garden Festival that she co designed with Andrée Davies and Adam White (Photo by Heathcliff O'Malley - WPA Pool/Getty Images)
LONDON, ENGLAND - JULY 01: Catherine, Duchess of Cambridge visits the Hampton Court Flower Festival with children from Hampton Hill junior school at Hampton Court Palace on July 1, 2019 in London, England. The Duchess visits her Back to Nature Garden at Hampton Court Palace Garden Festival that she co designed with Andrée Davies and Adam White (Photo by Heathcliff O'Malley - WPA Pool/Getty Images)
LONDON, ENGLAND - JULY 01: Catherine, Duchess of Cambridge visits the Hampton Court Flower Festival with children from Hampton Hill junior school at Hampton Court Palace on July 1, 2019 in London, England. The Duchess visits her Back to Nature Garden at Hampton Court Palace Garden Festival that she co designed with Andrée Davies and Adam White (Photo by Heathcliff O'Malley - WPA Pool/Getty Images)
LONDON, ENGLAND - JULY 01: Catherine, Duchess of Cambridge visits the Hampton Court Flower Festival with children from Hampton Hill junior school at Hampton Court Palace on July 1, 2019 in London, England. The Duchess visits her Back to Nature Garden at Hampton Court Palace Garden Festival that she co designed with Andrée Davies and Adam White (Photo by Heathcliff O'Malley - WPA Pool/Getty Images)
LONDON, ENGLAND - JULY 01: Catherine, Duchess of Cambridge visits the Hampton Court Flower Festival with children from Hampton Hill junior school at Hampton Court Palace on July 1, 2019 in London, England. The Duchess visits her Back to Nature Garden at Hampton Court Palace Garden Festival that she co designed with Andrée Davies and Adam White (Photo by Heathcliff O'Malley - WPA Pool/Getty Images)
LONDON, ENGLAND - JULY 01: Catherine, Duchess of Cambridge visits the Hampton Court Flower Festival with children from Hampton Hill junior school at Hampton Court Palace on July 1, 2019 in London, England. The Duchess visits her Back to Nature Garden at Hampton Court Palace Garden Festival that she co designed with Andrée Davies and Adam White (Photo by Heathcliff O'Malley - WPA Pool/Getty Images)
LONDON, ENGLAND - JULY 01: Catherine, Duchess of Cambridge visits The RHS Back to Nature Garden she designed at the 2019 RHS Hampton Court Palace Flower Show at Hampton Court Palace on July 1, 2019 in London, England. (Photo by Mark Cuthbert/UK Press via Getty Images)
LONDON, ENGLAND - JULY 01: Catherine, Duchess of Cambridge visits the Hampton Court Flower Festival with children from Hampton Hill junior school at Hampton Court Palace on July 1, 2019 in London, England. The Duchess visits her Back to Nature Garden at Hampton Court Palace Garden Festival that she co designed with Andrée Davies and Adam White (Photo by Heathcliff O'Malley - WPA Pool/Getty Images)
LONDON, ENGLAND - JULY 01: Catherine, Duchess of Cambridge visits the Hampton Court Flower Festival with children from Hampton Hill junior school at Hampton Court Palace on July 1, 2019 in London, England. The Duchess visits her Back to Nature Garden at Hampton Court Palace Garden Festival that she co designed with Andrée Davies and Adam White (Photo by Heathcliff O'Malley - WPA Pool/Getty Images)
LONDON, ENGLAND - JULY 01: Catherine, Duchess of Cambridge visits The RHS Back to Nature Garden she designed at the 2019 RHS Hampton Court Palace Flower Show at Hampton Court Palace on July 1, 2019 in London, England. (Photo by Mark Cuthbert/UK Press via Getty Images)
LONDON, ENGLAND - JULY 01: Catherine, Duchess of Cambridge visits The RHS Back to Nature Garden she designed at the 2019 RHS Hampton Court Palace Flower Show at Hampton Court Palace on July 1, 2019 in London, England. (Photo by Mark Cuthbert/UK Press via Getty Images)
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Middleton accessorized the midi dress with a pair of summer-appropriate espadrilles. Her hair was business as usual (natch).

The Back to Nature garden originally debuted at the Chelsea Flower Show back in May. With the help of landscape architect Davies White, the duchess recreated the outdoor display, which is currently at the Royal Horticultural Society’s Hampton Court Palace Garden Festival.

The new exhibit is twice the size of the original and features a grassy hill for kids, a pond for activities, a bee-friendly meadow and several architectural details—like rustic dens, waterfalls and streams. (The purpose is to encourage children to spend more time outdoors.)

For the picnic, Middleton partnered with several charities, including Anna Freud CentreEvelina Children’s HospitalAction for Children and Place2Be. The event consisted of a treasure hunt and a bug-spotting activity before attendees sat down for a picnic in the garden.

BRB, purchasing this Sandro dress before the Middleton Effect kicks in.

Related: Kate shows off her project to Queen Elizabeth 

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Kate Middleton stuns at Chelsea Flower Show
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Kate Middleton stuns at Chelsea Flower Show
LONDON, ENGLAND - MAY 20: Queen Elizabeth II and Catherine, Duchess of Cambridge at the RHS Chelsea Flower Show 2019 press day at Chelsea Flower Show on May 20, 2019 in London, England. (Photo by Geoff Pugh - WPA Pool/Getty Images)
LONDON, ENGLAND - MAY 20: Prince William and Catherine, Duchess of Cambridge at the RHS Chelsea Flower Show 2019 press day at Chelsea Flower Show on May 20, 2019 in London, England. (Photo by Yui Mok - WPA Pool/Getty Images)
LONDON, ENGLAND - MAY 20: Prince William and Catherine, Duchess of Cambridge at the RHS Chelsea Flower Show 2019 press day at Chelsea Flower Show on May 20, 2019 in London, England. (Photo by Yui Mok - WPA Pool/Getty Images)
LONDON, ENGLAND - MAY 20: Prince William and Catherine, Duchess of Cambridge at the RHS Chelsea Flower Show 2019 press day at Chelsea Flower Show on May 20, 2019 in London, England. (Photo by Yui Mok - WPA Pool/Getty Images)
LONDON, ENGLAND - MAY 20: Queen Elizabeth II and Catherine, Duchess of Cambridge at the RHS Chelsea Flower Show 2019 press day at Chelsea Flower Show on May 20, 2019 in London, England. (Photo by Geoff Pugh - WPA Pool/Getty Images)
LONDON, ENGLAND - MAY 20: Prince William and Catherine, Duchess of Cambridge at the RHS Chelsea Flower Show 2019 press day at Chelsea Flower Show on May 20, 2019 in London, England. (Photo by Yui Mok - WPA Pool/Getty Images)
LONDON, ENGLAND - MAY 20: Queen Elizabeth II and Catherine, Duchess of Cambridge at the RHS Chelsea Flower Show 2019 press day at Chelsea Flower Show on May 20, 2019 in London, England. (Photo by Geoff Pugh - WPA Pool/Getty Images)
The Duke and Duchess of Cambridge arrive at the RHS Chelsea Flower Show at the Royal Hospital Chelsea, London.
The Duke and Duchess of Cambridge arrive at the RHS Chelsea Flower Show at the Royal Hospital Chelsea, London.
The Duke and Duchess of Cambridge arrive at the RHS Chelsea Flower Show at the Royal Hospital Chelsea, London.
LONDON, ENGLAND - MAY 20: Queen Elizabeth II is shwon around 'Back to Nature' by Prince William and Catherine, Duchess of Cambridge at the RHS Chelsea Flower Show 2019 press day at Chelsea Flower Show on May 20, 2019 in London, England. (Photo by Geoff Pugh - WPA Pool/Getty Images)
LONDON, ENGLAND - MAY 20: Queen Elizabeth II is shwon around 'Back to Nature' by Prince William and Catherine, Duchess of Cambridge at the RHS Chelsea Flower Show 2019 press day at Chelsea Flower Show on May 20, 2019 in London, England. (Photo by Geoff Pugh - WPA Pool/Getty Images)
LONDON, ENGLAND - MAY 20: Queen Elizabeth II is shwon around 'Back to Nature' by Prince William and Catherine, Duchess of Cambridge at the RHS Chelsea Flower Show 2019 press day at Chelsea Flower Show on May 20, 2019 in London, England. (Photo by Geoff Pugh - WPA Pool/Getty Images)
LONDON, ENGLAND - MAY 20: Catherine, Duchess of Cambridge looks at a display during her visit to the RHS Chelsea Flower Show 2019 press day at Chelsea Flower Show on May 20, 2019 in London, England. (Photo by Yui Mok - WPA Pool/Getty Images)
LONDON, ENGLAND - MAY 20: Queen Elizabeth II is shwon around 'Back to Nature' by Prince William and Catherine, Duchess of Cambridge at the RHS Chelsea Flower Show 2019 press day at Chelsea Flower Show on May 20, 2019 in London, England. (Photo by Geoff Pugh - WPA Pool/Getty Images)
LONDON, ENGLAND - MAY 20: Queen Elizabeth II is shwon around 'Back to Nature' by Prince William and Catherine, Duchess of Cambridge at the RHS Chelsea Flower Show 2019 press day at Chelsea Flower Show on May 20, 2019 in London, England. (Photo by Geoff Pugh - WPA Pool/Getty Images)
LONDON, ENGLAND - MAY 20: Catherine, Duchess of Cambridge and Prince William at the RHS Chelsea Flower Show 2019 press day at Chelsea Flower Show on May 20, 2019 in London, England. (Photo by Geoff Pugh - WPA Pool/Getty Images)
LONDON, ENGLAND - MAY 20: Queen Elizabeth II is shwon around 'Back to Nature' by Prince William and Catherine, Duchess of Cambridge at the RHS Chelsea Flower Show 2019 press day at Chelsea Flower Show on May 20, 2019 in London, England. (Photo by Geoff Pugh - WPA Pool/Getty Images)
The Duke and Duchess of Cambridge arrive at the RHS Chelsea Flower Show at the Royal Hospital Chelsea, London.
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