There is a lot to learn about our arms. Sometimes patterns need to be changed a bit to get them to fit comfortably and/or correctly. There are many different arm variations that make it difficult to find a sleeve pattern that fits all. Learn how and why we can add width to a sleeve without changing the stitching line length of the sleeve cap. Learn about shoulder joint differences (long ones, short ones, forward ones, ones that tilt to the back) and how to adjust for them. See how to check your length and width measurements in a manner that will develop a better pattern for you.