Layer 1: A camicia/shift/smock/shirt or drawers or corset/pair of bodies. I don't expect you to make all three.
Layer 2: Either an underskirt or under-dress/petticoat, or doublet and slops.
Layer 3: The final layer will be either an over-dress, or a loose gown, or a cloak/cape.
Layer 4: An accessory - any one of the following: fan, pocket/pouch, hat/jewelled accessory for the hair, zibellino (also known as a "flea fur"), hanky, gloves, girdle, or shoes. A partlet, a set of Venetian shoulder/neck ruffs (if they are separate from the partlet), standing ruff/collar, and a muff are all also accessories.
I'm rather curious to see if we get this going as a cool Drachenwald contest. If so, I could see us doing this each year with a new theme. This could be LOTS of fun. Now I'm off to plan the right style with the fabrics I currently have.