There isn't really an "Amber level" for Pattern, it being so unique and all. But in general, it's calibrated by combining the original Amber Diceless rules and observations from the first two novels; if you've got 50 points in Pattern, you can do the stuff you see Corwin, Random, Bleys, Eric and so on doing in Nine Princes and Guns of Avalon. (Maybe count Random's chapter from the third book too - as a source of examples, not as a source of history).

50 points of Pattern and physical motion: you can change probability, and sometimes do minor "rewinds" like Random fixing the furniture in the Flora's sitting room.
50 points of Pattern and non-trivial motion between shadows was where the Amberites were swapping their gear in and out.

In other words, if I were to recommend changes to Mal's last couple posts vs what I felt was "off" about it: the sequence doesn't work. Mainly, gear phasing out and new gear phasing in, quickly and effortlessly, during purely mundane physical travel. Mal doesn't have that level of ability in Pattern. And in this case, he doesn't have any secondary abilities that would fill the gaps - such as sorcery, or being in a shadow he hellrode to and selected for malleability to his whims, or owning shapeshifting gear. It's better for me to be a jerk about it now than to let it go until actual conflicts happen between player characters and then I have to unwind a dozen posts at once

tldr: it wasn't the results that bothered me, it was the "how". Mal could have trivially done this by buying a suit and briefcase, or spending like half an hour cutting through shadow.