Someday, people will stop talking about the fact that Princess Kate has been wearing pantsuits, and only pantsuits, for nearly a month, but that day is not today. As People magazine puts it, Kate's style motto has become "eat, sleep, pantsuit, repeat," and her work uniform may be a tribute to her late mother-in-law, Princess Diana. [Says Bethan Holt, fashion director of the Daily Telegraph and the woman who literally wrote the book on Kate's style: The Duchess of Cambridge: 10 Years of Modern Royal Style." It shows that her confidence is growing and she is willing to take more risks and do something that may not have been natural to her"

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"While her love of fit-and-flare dresses and beige heels used to be her staple fashion, in recent months she has become more date-like in her fashion choices and includes pants in many of her smart outfits," People wrote. And whether it's suits or separates, a trend is definitely emerging when it comes to what she wears to the royal engagement ceremony.

"She is transforming before our eyes," Holt says. She may not be able to tell us, "Look, my life is completely different now, and my husband and I are one step closer to the biggest job of his life," but she is saying it through her fashion choices."

The current Princess of Wales is like the former Princess of Wales-Diana in that her style shift comes at a critical time in her royal life. Says Holt, "Princess Diana had a moment in the late 1980s when she wanted to be seen as more serious, when she wore trouser suits." She told designers, "I'm sick of fluffy ball gowns, I want to wear menswear." She had a great power suit moment. She wore blazers everywhere from movie premieres to polo matches and wore shoulder pads, as was common in the 1980s, People reported.

Of Kate's style transformation, Holt said, "I think what's really interesting is that it's going in a pretty serious direction. 'There's a lot of very sophisticated tailoring, very sleek silhouettes, and a fairly restrained look.'