The End of XL

The End of XL

As Americans shrink, so too will their clothes. If even just 50% of people adopt HOTs, the dramatic reduction in weight will also lead to a societal reduction in clothing sizes, and demand for fabrics which will have a profound impact on the apparel industry, and the planet.

The BELIEVE trial documented an average waist circumference reduction of 8.66 inches (22 cm) which is roughly equivalent to dropping from a size 2XL to a size Large.

With 184 million U.S. adults classified as overweight or obese, at a conservative 50% market penetration, HOTs would be adopted by 92 million people. An average baseline waist circumference of overweight/obese people of average height would be about 42 inches for men, or 36 inches for women. The 8.66 inch reduction brings the new average to 33 inches and 27 inches respectively. 

Shrinking Fabric Demand

When nearly 92 million people need smaller clothes, the textile industry will experience a structural demand shift. Each size reduction decreases fabric consumption not just by surface area, but by improving manufacturing efficiency. A basic T-shirt saves only 0.25 square yards per size reduction, complex items like denim and outerwear yield savings of 0.80 to 1.30 square yards. Averaging across typical wardrobe mix of tops, bottoms, and jackets yields a fabric savings of 0.65 square yards per garment for individuals transitioning from plus/large sizes to standard sizes.

Assuming each adopter purchases an average of 20 core apparel items annually (a mix of tops and bottoms), the calculation indicates a massive contraction: 92 million people × 20 garments × 0.65 sq yd savings equals an annual fabric demand reduction of 1.2 billion square yards.

Our Clothes are Made of Plastic

Given that the modern apparel market is over 60% synthetic, this fabric contraction has a direct impact on petrochemical demand. A 1.2 billion square yard total reduction implies cutting polyester fabric production by roughly 718 million square yards. Assuming a weighted average fabric weight of 6.0 oz/yd², this translates to an annual raw material drop of roughly 122,000 metric tons of PET. Since the apparel industry is a major end-market for recycled PET (rPET) from plastic bottles, this demand drop threatens a key revenue stream for recycling. This could depress rPET prices and undermine the economic viability of plastic bottle collection programs.

The Environmental Paradox

Microplastic pollution from laundry is a major contributor to ocean contamination, with textiles accounting for an estimated 35% of primary microplastics in the world's oceans. When the total mass of synthetic fabric being laundered decreases because wardrobes are now filled with smaller garments, the volume of microplastic shedding decreases proportionally. 

This long-term environmental gain must, however, be weighed against the potentially devastating short-term textile waste disposal event that occurs when 92 million people discard all of their oversized clothing at once. The sheer volume of this will very quickly overwhelm donation and resale infrastructure flooding these organizations with plus-size apparel at the exact moment market demand for those sizes collapses. Instead, the vast tonnage of synthetic textiles will be diverted directly to landfills. In landfills, non-biodegradable garments don't decompose, they slowly fragment over decades, shedding microfibers into soil and leachate. This creates the potential for a massive, concentrated heap of terrestrial microplastic pollution that could partially or fully offset the long-term gains from reduced laundering.