Finally, the best part of your croquet ensemble- accessories. I've chosen some of my favorites. See my picks for both preppy and romantic dresses here and here.
I really love the idea of a little neck tie this year- the tropical silk Valentino scarf is a piece you'll own forever, and the pearl print Ted Baker is a steal at $30.
To shop small/local, try Evergreen Antiques (so much vintage and antique jewelry), Hats in the Belfry, One Petticoat Lane, Lilac Bijoux, Kokopelli, and Way off the Beaten Path.