After all the rumors—Ralph & Russo, Christopher Bailey, Edrem, McQueen—Page Six has reported that Stella McCartney will be designing Meghan Markle's wedding dress for the royal wedding tomorrow.

"Stella is such a perfect fit for Meghan, she uses organic fabrics and her ethos is the same as Meghan. Her style is very underplayed, her dresses are very clean in style, very much Meghan—and they are friends," British bridal designer Caroline Castigliano told the outlet. "I believe it will be a very straight, fitted dress, with a big nine-foot train that comes off the dress from the side to create the drama, and lace trickling down the top of it." The designer also said Markle will be wearing a tiara from the late Princess Diana's collection.

Castigliano went on to say,"I’m sure [the dress] will be very different [from] Kate Middleton’s, although it will share some of the same aspects—sleeves, shoulders covered, no cleavage showing, and it’s highly likely that she’ll have her back covered too."

It was rumored that McCartney would be designing the dress after Markle was seen in a Stella McCartney cape dress in April. "I read this morning that you are designing the royal wedding dress,” a reporter from The Guardian said to the designer in April. "Oh, you did, did you? You’re hilarious. How many designers have you said that to today?" When the reporter pressed, McCartney remained aloof: "Well, you didn’t actually ask a question."

McCartney's longstanding commitment to vegan materials and environmental sustainability aligns nicely with Meghan and Harry's values. (The Wilderness Foundation UK and Surfers Against Sewage were among the seven charities the couple selected for their public gift registry.) McCartney is also attractive as a British female designer who owns her own business.

Markle has been seen in a few Stella McCartney designs. In January, she wore a black Stella McCartney coat to an event in Cardiff.

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In April, she wore the cape dress to Queen Elizabeth's birthday party.

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While McCartney does design evening wear—most recently she designed dresses for Miley Cyrus and Paris Jackson at the Met Ball—she's most renowned for a casual sort of cool elegance in the ready to wear market.

Jackson and McCartney at the Met Ball. Getty Images

Looks from the spring 2018 Stella McCartney show. Getty Images

Looks from the fall 2018 Stella McCartney show. Getty Images

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