We Thought Kate Middleton's Dress Was Simple, but Then She Turned to the Side

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You've got to hand it to Kate Middleton: she really knows what she likes when it comes to style. The duchess is all for rewearing old favorites, shopping the same labels, and following tried-and-true outfit formulas. So when she decides to switch things up, there's likely a good reason.

During a visit to Stewards Academy, Kate opted to give a nod to NYFW, rocking American label Altuzarra for the first time. Although the brand — which recently revealed its stunning Spring '17 collection — is a new one for the royal, the blue, button-front, dotted design seemed just her style. Then Kate turned to side, revealing a bit of leg through a slit, and we realized this was no ordinary number.

Check out the modest yet subtly sexy piece ahead, and shop it for yourself before it sells out.

Kate Middleton's Dress Seemed Pretty Modest
Getty | Karwai Tang

Kate Middleton's Dress Seemed Pretty Modest

But It Actually Had a Slit on the Side
Getty | Karwai Tang

But It Actually Had a Slit on the Side

Which Showed Off Some Leg
Getty | Karwai Tang

Which Showed Off Some Leg

It Was a Subtly Sexy Choice For Kate
Getty | Samir Hussein

It Was a Subtly Sexy Choice For Kate

And Her First Time Rocking Altuzarra
Getty | Danny Martindale

And Her First Time Rocking Altuzarra

She Paired the Piece With Her Everyday Jewels
Getty | Chris Jackson

She Paired the Piece With Her Everyday Jewels