Measurement is easy. Even the elastic deformation (i.e. multiple poses).

Manufacturing at scale is currently impossible.

Tailoring is basically robotics' worst nightmare: input material with varying characteristics from batch to batch, delicate materials, multiple different motions and tasks, a non-reducible movement and orientation space (e.g. sew a hem along a curve), and a complex mapping between physical tasks and end result (different stitch on seam = different motion).

We'll get there (and if it weren't for low cost labor, would already be there for t-shirts). But it's really hard.