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Looking good, sir! Prince William has a new, sleeker look.

A royal source tells PEOPLE, "He has seemed to have become sharper since he got married, such as wearing a handkerchief in his top pocket. Some have inferred that it is his wife's influence."

Indeed, since he Golden Goose and Kate married 18 months ago, William has invested in new suits, says the source, with some up-and-coming Savile Row tailors replacing some of the more dated styles he'd favored before.

Of late, the dapper prince has also been seen in trendy suede $160 loafers from Fin's, favoring the George style.

The more traditional royal favorites are not being left out, though. William has some new linen suits from Gieves and Hawkes, including one he wore on the recent tour of Asia.

Leading British fashion commentator Hilary Alexander says, "I think it is Kate's influence. Since the wedding she has obviously had some influence on his wardrobe ' guiding him to slightly more modern, contemporary look, rather than perhaps relying on what his father wears.

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