It sounds like you are looking for more of a pattern designing tool. There are open source projects that might be more suited to this than freeCAD. Try searching online for “open source textile pattern software”
I can’t vouch for this program/project as I am not involved nor have I used it; but Velentina sounds like it is capable of doing what you mentioned.
The sketchers in freeCAD can be used to draw and constrain the patterns, and then print them to scale and cut them out to see how it works.
(Note I have not tried to print to scale from freeCAD specifically but I would imagine it is more then capable of doing so assuming your sketches are smaller then the paper you are printing on)
Of course freeCAD can be used to do the physical modeling but I am unaware of any tools that would specifically assist you for textile pattern designs. The closest tool that I am aware of is the sheet metal workbench.
Hopefully this was helpful.
Someone else might be able to suggest a freeCAD specific solution but this might help get you started.
In case anyone was scrolling by and is interested the quote is a bit misleading out of context, Marx isn’t saying we should do this, he is more saying that capitalism requires “us” to do this, while telling us if we just stop eating avocado toast we too could become part of the billionaire class. While of course they themselves would never live without these supposed needless things.
Read it in context here Need, Production and Division of Labor, this link is directly to the section the quote is from but in my opinion the formatting isn't as good.