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From monochrome suits to patterned dresses to cozy autumn jackets.

For the first time since 2014, Catherine, Princess of Wales, returned to America—and, as per usual, the senior royal's elegant style did not disappoint.

Today, Kate and Prince William wrapped up their three-day Boston tour, which began on Wednesday, November 30. During their visit, the pair met with world leaders and hosted their second annual Earthshot Prize Awards in honor of five advocates of environmentalism.

For each of her engagements, Kate dressed the part, wearing a series of sleek coordinated looks, from monochrome suits to midi dresses, further defining her timeless royal style.

Ahead, see all her stylish looks from her trip to Boston.

Princess Kate wears a stunning mint green off-the-shoulder gown and jewel choker necklace on the Earthshot Prize 2022 green carpet at MGM Music Hall at Fenway.

The princess continues her tradition of earth-friendly dressing for the Earthshot Prize Awards, renting an off-the-shoulder belted gown by Solace London from the U.K. designer rental platform HURR. Her accessories include sparkly stiletto heels, halo emerald-and-diamond earrings by Aspery, and an emerald-and-diamond choker that belonged to Princess Diana.

On her final day in Boston, the princess opts for a bold, black, and blue checkered houndstooth midi dress from Emilia Wickstead—paired with black Gianvito Rossi suede pumps, gold Liv Thurlwell hoops, and a baby blue mini handbag. She wears the look to discuss research advancements for the lives of children at Harvard University.

The princess brings a pop of color to her collection of suits while paying a visit to Greentown Labs in Somerville, Massachusetts, wearing a wine-colored suit set paired with a light pink blouse with a pussy bow collar.

Kate embraces autumnal style in an earthy, all-brown ensemble during her visit to Piers Park with Prince William. She pairs a dark brown double-breasted coat with a matching brown scarf and gloves, as well as pointed suede boots.

The Prince and Princess of Wales brave the cold during their visit to Piers Park, where they bundle up in respective navy and brown wool coats.

Following her first day of involvements with Earthshot, the princess opts for a more dressed-down look—a cobalt blue double-breasted tweed blazer by Chanel paired with dark gray jeans and black suede pumps by Gianvito Rossi—while enjoying an evening with Prince William at the TD Garden arena for a game between the Boston Celtics and the Miami Heat.

William matches Kate's blue look with a casual blue suit of his own and light blue denim button-down.

Kate wears an elegant green Burberry dress paired with matching green pumps during her visit to City Hall to meet with Mayor Michelle Wu.

She coordinates her Burberry dress with additional green pieces—an Alexander McQueen coat and Mulberry top-handle mini purse—topping it all off with Shyla pearl earrings.

The princess looks as polished as ever upon her arrival in Boston's Logan International Airport, where she steps out in a monochrome navy suit set paired with classic black pumps. Her hair is kept to her signature sleek down 'do, which is enhanced with drop jewel earrings.

The Prince and Princess of Wales arrive together in America at Boston's Logan International Airport to begin their involvements with the Earthshot Prize Awards.