The instructions for the sleeves of the tartan jacket says to make the two exactly the same. Normally this is fine, but the vertical part of the tartan pattern is intentionally off center. When worn it will look different, as noted in the directions. I'm thinking of knitting the sleeves so that it will look symmetrical when worn. Since their is only one vertical color on the sleeve and it's the same color I don't think it would look bad at all. Why did she do this? I'm not following. With the two front pieces I see why she would design the vertical color combination differently. Hmmm?