Chanel is for well versed, chic couples with similar styles like Chloe and Brooklyn – they have so much in common- their parents summer on the same islands, they love to sail, they spend the winter holiday at the same resorts and they prefer dining out.
Those two love birds are growing up under the same glamorous circumstances where color coordinated looks are a part of their culture. If she borrows his sweater and styles it with a pair of boots I honestly wouldn’t notice. It’s all chic to me.