Even with the angled body you can see his shirt has a perfectly straight bottom edge.I don't think the Ness consistency thing is a good indicator if it's fake. The N64 has only 4-striped sleeves and they are in reverse order, so it doesn't follow the same pattern. There could still be a smidgeon of yellow on Ness' right side that were not seeing, since he's tilting his left side forward.
#IWantToBelieve
Also the N64 version was the first one so I can excuse the sleeves on that. Since then they've made sure to follow the design to a t. It would be odd for the same director not to notice they haven't done that again with the new model.