Make sure that the garment has short sleeves; if the pattern you are planning on using doesn’t, make adjustments to shorten the sleeves. You’ll also want to choose the right type of fabric; flutter sleeves work best with lightweight fabrics that flow, such as organza and chiffon or rayon. You also want to make sure that you have needles, thread, scissors, chalk, and rulers easily accessible.
To get started, cut the sleeve portion of the pattern or the material that you are working with to your specific dimensions. Use a ruler to measure the piece so that you can locate the center.
Draw one line in the center of the arm and another line at the halfway point between the seam that runs along the underarm and the center line on the back of the sleeve.
Locate the middle point between the first two lines that you’ve drawn. Create a third line at this point, using the same technique you used to draw the previous lines.
Repeat steps 2 and 3 on the front of the sleeve.
Cut along each slash line, but use care not to cut completely through, but rather to, the edge of the sleeve cap. Spread out the sections to a width you would like (between 1 and 1.5 inches is ideal).
Position a piece of pattern paper under the sleeve pattern and tape along the edges and between the slashes.
With a curved ruler, complete the pattern and create a new grainline along the center of the sleeve. Cut the pattern piece.
Transfer the pattern to the sleeve. Trace the pattern onto the material and sew a basting stitch ¼ inch from the lower edge.
Using the basting stitch as a guide, fold the lower edge of the material to the wrong side.
Using a hemstitch, sew the fold 1/8 inch from the edge. Trim as close as you can to the stitching line to prevent any bulk.
Roll the edge of the fabric on the wrong side and use an iron to press it in place.
Once you’ve completed all of these steps, finish off the hem, and you’ll have beautiful flutter sleeves for your garment!