A to B is the length of the sleeve
A to C is the arm hole depth.
Line D to E is the hand circumference. I use hand circumference instead of wrist so that I don’t need to add buttons on the sleeve.
Through point C draw a line the length of the bicep circumference.
Divide the line evenly into 6 sections.
Draw lines from each point.
Draw a line from point A to F and from point A to K forming a triangle. Draw a line from F to D and K to E. Label the section F for Front and B for back. This is the left sleeve.
Line G place a dot 3/4″ below the intersecting line.
Line H place a dot 3/4″ above the intersecting line.
Line I place a dot 1′ above the intersecting line.
Line J place a date where the two lines intersect.
Use a french curve to connect the dots.
Leave a 1/2″ inseam around the pattern.