Hm...Directional Sewing?

I had some time a week or so ago to get to the jacket muslin that's been in the queue for absolutely ages, and I noticed something that I thought was worth a mention.

Notice that the shoulder seams line up nicely on the right shoulder, and are totally wonky on the left:



The only culprit I can think of is that I stitch-marked the seam allowances before I sewed the pieces together, and I sewed the shoulders one way on one side and the other way on the other one, so that one side stretched and the other didn't.

I won't be stitching unstabilized pieces on the actual jacket, but it was interesting to see such a definite illustration of one of Cynthia Guffey's concepts!