The argument that ‘plus-size’ clothes cost more because they take more fabric is bullshit. If clothing sizes were priced by the amount of material they take to make, each size would cost a little more than the size below it. And if a size 20 would cost more than a size 12 then a size 10 should cost more than a size 2. But it doesn’t. Because your argument is fucking bullshit.
And if fat bodies were valued as much as thin bodies, the extra cost in materials would be applied over all sizes and averaged out to one price. If fat bodies were valued as much as thin bodies, this wouldn’t even be a fucking conversation. End of story.