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Divide the bicep line with 6 points and mark the points. Create vertical lines going up from points E through H. Draw a diagonal line from points D to A and I to A. Mark your points for the armhole and shoulder curve. Draw curve that goes through all of the points starting at D and ending at I. Cut out the pattern you have traced.
Measure your bicep line and divide it into 6 equally spaced points. Place 3 points on each side of the C point which is the center of the line. Then, mark the points from left to right using the letters D through I. This will make it easier to differentiate them. To evenly space your line, divide the total bicep measurement by 6. For example, if the bicep line is 24 inches (61cm), then your points on the line will need to be 4 inches (10cm) apart. Draw vertical lines extending upwards from points E and H to the level of point A. Use a ruler or straight edge to make the lines straight. These lines should be parallel to your central line that extends from points A to C. Next, use your ruler or straight edge to draw a diagonal line that extends from point A to D and another that extends from point A to I. These lines should only connect the points, and not extend beyond them. The shoulder curve will connect to the shoulder area of your bodice piece, and it requires some precise markings. Make a mark in the following places. Above point E 0.75 inches (1.9cm) below the diagonal line. Above point F 0.75 inches (1.9cm) above diagonal the line. Above point G 1 inch (2.5cm) above diagonal the line. At point H where diagonal the line crosses it. After you have marked all of the points for your armhole and shoulder curve, draw a curved line that goes from point D through all of the points you just marked, and that ends at point I. A French curve tool is helpful for creating this curving line. However, you can use another curved object or try to draw the line freehand if you do not have a French curve. Your sleeve pattern will be complete after you mark the curved line for the shoulder curve. Cut along the lines you traced onto the pattern paper, and then use your sleeve pattern to cut out sleeves for your project. After you have cut out the pattern piece for your sleeves, use it to trace the sleeve shape onto your fabric and cut out the shapes that you trace.