There are also limits to how we can cut the materials we use in clothing. Classic tailoring uses a careful distribution of ease to allow garments to fit but also flex with the body. There's a limit to how far the geometry of taking a 2D fabric and turning it into a 3D garment can go, especially when obesity blows out proportions so far outside of the norm. Granted most fast fashion crap these days is made of knits to fit a wide range of (normal, human) body types which sort of works but don't get me started on cup sizes. With that being said, it's even more telling that these clothes look so bad on fat bodies. It's further evidence of just how distorted their bodies have become.