blazer: gap (similar here). shirt: CA boutique. pants: asos (similar here & here). shoes: elie tahari. jewelry: helen ficalora, banana republic.
I love the sporty pant look that CNC Costume National helped popularize on the runway last fall. Not only is it an easy item to incorporate into your existing wardrobe, but it also can effortlessly be dressed up or down.
As a styling tip: To steer clear of looking like you just exited gym class, balance your sporty style with feminine pieces.