Kate Middleton in Navy Blazer at Olympics 2012

Leave it to Kate Middleton to achieve that classic prepster look without having to go the popped-collar polo route. While she debuted a similar Smythe blazer ensemble yesterday, it's today's Olympic equestrian-bound attire that caught our eye. Why? Kate utilized three preppy styling staples — a tailored navy-blue blazer, a striped top, and canvas cork wedges — to perfection, thus proving that an easy combination can instantly strike that nautical-inspired note so essential to cultivating a preppy look.

• To put your own spin on the off-to-the-races-meets-sailing vibe, just employ ultrastructured top layers (like a tuxedo-style blazer) with more classically inclined pieces underneath (stripes being the most obvious choice).
• Stick to a classic color scheme — neutral tones, navy blues, cherry reds, and of course, crisp whites.
• Rather than opt for a boat shoe, a cork wedge or summery espadrille will round out the outfit nicely.

Ready to emulate Kate's Olympics-day-four style? We've culled our favorite blazer, striped tank top, and wedge combos to shop below.