Sleeve cap ease is bogus (2005)
The pattern maker who got the stripes to match in both dimensions probably used a textile CAD program to do it. There's software for this. High end: [1] Low end: [2]"Pattern Design Software (PDS) 3D -- A set of 3D tools that display virtual samples in an innovative 3D digital environment that allows you to fashion your garment and make quick alterations at the click of a button, powered by photorealistic rendering for a true-to-life visualization.""Inspect simulated cloth using a tension map to view the exact value of tension, distance, and stretch..."These tools are also used for clothing for characters in games, movies, and virtual worlds. Marvelous Designer is often used for Second Life clothing.[1] https://optitex.com/[2] https://www.marvelousdesigner.com/