It really depends on what you’re doing this Saturday.
Here are three options for different occasions.

1) Jeans, turtleneck and an uber cool pinstripe coat. A relaxed outfit but stylish enough if you’re having brunch at a fancy restaurant – my personal favorite
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2) Cargo pants, checked shirt, sweater and a vest – if you’re going on a trip to the mountains. Play with the colors.
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3) A two-piece suit if you’re looking for something more elegant. Make sure you don’t look too preppy – this is not a business meeting. Wear a cardigan to make it less formal and open a couple of the shirt’s buttons. Also, if you want an outfit for the night, pick a suit in a darker color.
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Don’t forget to compliment her outfit whenever you get the chance.