So in theory 3D-Knitting can produce a made-to-measure garment on demand, and has been able to for years.

And yet, no one actually offers to sell you a made-to-measure knitted garment. Why?

A few theories: - Knits are stretchy so there's limited demand for M2M - DFM/software issues - no one actually knows to generate a pattern from a set of sizes without human intervention - Issues with OEE - it's inefficient to wait for orders to produce the garments because the capital cost of the machines is so high. - Logistics - you don't want to deal with shipping everyone the right order.