I used her method but made longer skirts- the biggest of the two was 27" long, the small one was 24" long. So I made the strips 54" long for the first, 48" long for the second. When I got to the fabric store, I found that the more delicate-looking Illusion netting, 108" wide! so I could get twice as many strips per yard- was on sale for $1/yd, so I got that instead of the coarser netting. I used almost 5 yard for the bigger skirt and about 4 1/2 yards for the smaller one. For the larger snowflake overlay skirt (18" long), I bought turquoise sparkle tulle, folded it in sixths cut a circle with a 22" radius (needed 1 ¼ yds); cut out a circle for the center, and cut it like a very simple snowflake. The smaller overlay (14" long) only required 1 yard. By the way, there's a great website that allows you to create snowflakes online and see what they'll look like before having to cut any actual paper.
The snowflake crowns were cut from the bottom of a plastic gallon-sized milk jug, then my girls colored the snowflakes blue. See the slideshow for photos of that.