The Duchess of Cambridge Mastered Athleisure in Her Sunday Sports Kit

For many sporting events, the Duchess of Cambridge opts for skinny jeans, a blazer, and wedges. But when she joined Prince William and Prince Harry to promote their Heads Together campaign at Queen Elizabeth Olympic Park, the duchess took a truly sporty turn. Slipping into New Balance trainers and movable denim, Kate pulled on her new red puffer coat — an essential most of us were at least planning on buying this year. Though the trend calls for a slightly oversized fit, Kate's jacket ran snug, giving her outfit (however casual), the polished touch she prefers. Read on to get a look.