openwork

/ˈoʊpənˌwɜrk/
noun
  1. A decorative pattern or design with openings or holes, as in fabric, metal, or wood.
    • The wrought iron gate featured intricate openwork that let the garden show through.
    • She wore a blouse with delicate openwork embroidery around the collar.
    • The wooden screen was carved with beautiful openwork patterns of leaves and vines.