Modeled by my somehow-still-living snake plant, since the Christmas tree is long gone.
Depending on how you look at it, this project is one month late, or eleven months early. Either way, it was a quick and easy project, good for someone like me who's just getting back into sewing. Now I'm all set for next Christmas!
The skirt is composed of 16 teardrop shaped petals, sewn together with a zigzag stitch, left open at the back for convenience, and open at the center to fit the tree.
Template and how-to from Martha Stewart Crafts, available here.