H&M

H&M produces a staggering 3 billion garments each year, making it the largest offender by volume on this list despite its greenwashed 'Conscious' line. The brand has been fined $500,000 for destroying 12 tons of unsold stock annually, contradicting its recycling claims. Its garment-collection program recovers less than 1% of what is sold, underperforming even Pretty Little Thing's meager 0.5% reuse rate.