Inlay

I'm not much of a knitter, but I'm going to yap anyway. Based on the quote from Nike in this article, it sounds like they tried to design these as single knit garments rather than cut and sewn from flat fabric. This can save a lot on material because there is much less waste.

"Nike’s new collection of #WorldCup kits — which were reportedly made with the help of AI — is a sartorial catastrophe. Nike manufactures the kits for numerous national teams, including England, France, the US, and Uruguay, and has done so for decades. Uruguay’s seemed to be the worst off…" #Design

Nike's reportedly AI-designed World Cup jerseys debuted with comically misshapen shoulders that are impossible to ignore.