Outdoor curtains

Imagine this: You're on the front porch of a to-die-for-gorgeous Southern colonial (just off of this vineyard) complete with extraordinary hydrangeas atop white linen tablecloths. The chairs are a luxuriously comfortable and I-haven't-a-care teak perfect for a covered outdoor setting. The masterpiece is in the direction the wind is leading your cheek - Look at those white curtains. Where can you even buy curtains that glamorously long and flowing? They extend from the top of the porch, likely between 15 and 20 feet tall and move elegantly as the wind passes through breakfast time. Is there anything more sophisticated?