H&M x Versace (2011)

This Donatella collaboration generated overnight camping lines but delivered garments so poorly constructed that Medusa-head prints literally peeled off after a single wash. It is cheaper than the average fast-fashion item—yet still priced at $80—making its disposability even more cynical. Embodying fast fashion at its worst, this partnership outperforms #2's Tiffany collab in terms of customer disappointment, as buyers felt actively cheated by the low quality.