I believe this is right. I don't have any posture/alignment issues and I think its the size alone that gives this impression.I think its purely as the jacket is to big it is sitting off centre to the body hence on the wearers left side there is a gape at the neck and the left sleeve slightly shorter and gives the impression of a shoulder and hip issue but I think the jacket is playing havoc with his look purely as it is huge.
A brief update: I brought them back to the store. The manager was *extremely* apologetic...going so far as to bow 90 degrees (reserved only for the biggest screw-ups). He said he didn't know what happened but he'll get to the bottom of it. The jackets are going to be re-made at no cost.