This green skirt from Zara (seen here) is doing double duty by matching it with a striped dress. You can have two layers on top, so why not two layers on bottom? I cinched in the waist with a nautical belt, and I think it gives the right amount of prep to an untraditional outfit.
Dress: Gap. Skirt: Zara. Belt & Bracelet: H&M. Shoes: Banana Republic.