Polly desires her Beatrix skirt to have a tall flounce. Skirts of this era often were flounced, although as 1909 turned into 1910 and then the 19-teens, flounces appear to receded in popularity in favor of bands of flat embroidered, lace, or pleated decoration.
Some of the prettiest flounces I've seen are graduated in height. A graduated flounce might start at, say, seven inches in height at the skirt's front panel, but incrementally become taller until it might reach some fifteen inches at the back of the skirt. Combined with a short train, the effect is of two curving lines receding from one another.
Another characteristic of Edwardian tall flounces is that they were frequently cut shaped and on the bias, so that the top of the flounce would be sewn on flat, while the bottom, being wider and on the bias, fluttered out. Such flounces are softer and more clingy than a flounce made of fabric cut straight of grain and then gathered.
Emma Ruth of the Sense and Sensibility described how to make a shaped flounce, and I followed her directions in making Polly's flounce, photographing as I went. Here is how it went:

First, I laid the skirt pattern pieces out on the floor, one right next to the other and matching the seam marks, as if they were making up the shape of half of the skirt.
Then I taped several pieces of waxed paper together and laid the resulting piece of paper on top of the pattern pieces.
In the first image you can see the pattern pieces laid edge to edge, and the waxed paper placed atop.Next, I traced the line of the bottom and sides of the skirt pattern pieces onto the wax paper.

After this I drew the flounce line. Starting at front of the front panel pattern piece I marked a spot at 7 inches or so from the skirt bottom. Then I drew a curving line that increased in height as it went to the pattern pieces for the sides and then back of the skirt, ending at a position about 15 inches from the bottom of the final, back skirt pattern piece. I cut out the result. Now I had the basic pattern for the flounce, but...I needed to make it flare.
In the second image I have drawn and cut the basic flounce pattern. The front of the skirt is to the left; that's where the flounce is most narrow. The back of the skirt is at the right, where the flounce is widest. Like most pattern pieces, the pattern is for one half of the flounce.
So, on the base pattern I drew long vertical lines several inches apart, from the flounce bottom almost to the top. Then I cut each line with scissors, slashing the pattern pieces and spreading them at the bottom. The more I spread each slash, the wider the fabric would be at the bottom of the flounce and the more the resulting fabric would flutter and flare.
In the third image, a closeup, you can see the vertical lines drawn across the pattern, ready to be cut and slashed.
Finally, I laid another piece of wax paper over the slashed and spread pattern, drew a fresh pattern, and cut that out. Voila, shaped flounce pattern!
In the final image, I have cut and slashed the pattern to create the shaped flounce pattern, and have laid a layer of waxed paper atop, ready to draw the final pattern. Because slashing causes the pattern to curve, I had to add several little pieces of wax paper to fit the curve.(Emma Ruth noted that if I wanted a gathered flounce I would have slashed each line from top to bottom to break the pattern into separate strips, and then would have spaced them out. Then I would have cut a new pattern from the resulting shape.)
Emma Ruth had another note about preparing the flounce: hem it before applying it to the skirt. Otherwise you're in for a lot of work.
Warm thanks to Emma Ruth for her kind direction. It all worked so well.
Sewing Mornings ContinueA few days later, Polly and I met to work on her skirt. We seamed the main skirt up, and Polly had her first experience using a treadle. She took to it immediately, even getting the hang of working the W&G wheel, which turns in the opposite direction of most sewing machine wheels.
Then I used the flounce pattern to cut out Polly's flounce from her navy and white stripe seersucker, and laid it on the plain skirt. What a nice effect! The stripes on the bias contrast nicely with the stripes on the straight part of the skirt. Can't wait until it's applied to the skirt.
That day's work was attended with a few technical difficulties, shall we say? I hoped to use my Singer handcrank's gathering attachment to make the small ruffle to attach to the main flounce, but it kept jamming, and then the Singer's tension went wonky, a condition from which it has yet to recover. Yargghh. So Polly gamely worked on a trimming ruche by hand...
A few days later we met again, and I demonstrated applying a period placket, using an original garment as a design guide, and we set the waistband, too.
Working on that fabric has been most interesting: did you know that working with narrow striped fabrics can make you dizzy, and ditzy? After several hours of cutting, sewing and ruching, both of us felt a little woozy.
And Rebecca's skirt? It's seamed up and has its waistband, and is ready for the lace insertion. I even found some true period torchon lace to use to trim it with!