Circle skirts are known for their flowy appearance, so it is best to choose a material that isn’t too heavy or stiff(we recommend flounced garments). The waistband is made from exposed elastic, so choose an elastic in a width and color that you like. A wide waistband measuring 3 inches (7.6 cm) or more is a fun way to top off your skirt. Use a soft measuring tape around your hips where you would like the skirt to sit, typically the widest part. Because this is a circle skirt, a bit of geometry is necessary to find the measurements. To find the radius of the skirt, take your hip measurement and add two inches. Then, divide this number by 6.28; the answer is the radius of your circle.  For example, if your hips measure 30 inches (76.2 cm), add two additional inches and divide by 6.28 (32 / 6.28). This will give you a radius of about 5.1 inches (13.0 cm). Measure the elastic by adding one inch for a seam allowance to your total hip measurement. If your hips measure in at 30 inches (76.2 cm), your elastic should be measured and cut to 31 inches (78.7 cm). Measure the length of the skirt by using a soft measuring tape to find the distance from your hips to your desired end point. Add an extra inch of length for seam allowance. Fold over the bottom ¼ inch of the edge of the skirt and use an iron to flatten it out. Then fold this section over again, and use a straight or zigzag stitch to hem it all the way around the edge.

How would you rephrase that briefly using Chinese?
准备材料，布料选择应尽量轻盈，最好不要用太重或太硬的布料做圆形裙。 测量需要的数据有：你希望裙子穿在什么部位，特别注意要把臀部最宽处包含在内，因为是圆裙，太小可能穿不上哦。 包底边，将底部约6毫米的边折进去，熨平，再折一次，最后用直线或是Z字型针法缝合。