Technically you could make this fully machine assembled, but then capital costs of starting and setting up the production line (which has been done) would neces

Technically you could make this fully machine assembled, but then capital costs of starting and setting up the production line (which has been done) would necessitate at least hundreds of thousands of pieces and more expensive than cheap fast and simple bad sewing jobs in third world countries. (Like for socks.) While SewBot for example is not advanced enough, a real production line can be made. The trick is catching and pulling the fabrics so they're rigid as well as good alignment. It's hard to ensure for even advanced process engineer, much less for this process to be fast. This would probably return if costs of labor for setting would increase dramatically. Nobody would sell enough of these with the proper fabrics, and even with the cheap blend it would create lots of waste to cut the many pieces for sewing. At the same time, you could mostly knit whole clothing instead if you go fully automated.