This is for pattern drafting, which assumes knit or woven fabric as the raw material for the garment construction, along with the pattern.
That said it still does not seem suitable for this task based on my experience sewing from and modifying patterns.
This looks more like something for making clothing as digital content - e.g. Marvellous Designer. Possibly more straightforward even.
Edit: found interfacing. It calls it "interlining".
Then Clo exports a file for fabric cutting compliant with the ASTM D6673-10 standard, Standard Practice for Sewn Pattern Data Interchange, which is used for the production of garment patterns. It's kind of clunky, being based on Autodesk DXF, AutoCAD's export format from the 1980s, but it's what the industry uses. You can bring such files into anything that reads DXF and view them. So a widely used formal descriptive language for fabric cutting already exists. You can send those files to a contract garment manufacturer and get garments back.
Marvelous Designer is just Clo minus the cutting pattern export feature.
[2] https://www.normsplash.com/Samples/ASTM/191361149/ASTM-D6673...
But the comment I was responding to seemed to be using "stitch" in the way knitters use it, not the way sewists use it. No pattern drafting system can represent the stitches necessary to create a panel of knit fabric, that's simply not the level of abstraction they work at.
This thing isn't good but not for the reason of being unable to represent a one-strand mitten or whatever, which is what I think they were getting at.