I don't think the stripe pattern is different, rather how the cloth material is placed.
On the prototype the stripes look different because they contort with his twisting body. If you look at the middle red stripe, the bottom of that stripe meets the middle of his pants on the proto. On the production piece, the bottom of the stripe is off center from his pants. Imagine when he stands straight up, his shirt would actually be crooked.
The stripes should be at a slant because he's twisting his body.