Fast fashion put waste into overdrive, easily by a factor of two thirds as it specifically encouraged online ordering with free returns so that consumers ordered their size, a size above, a size below and returned two out of three purchases .. rather than sell "worn goods" returns went to land fill.
The mountain of excess production (consuming energy, resources, producing excess CO2, etc) that comes with the past decade of fast fashion brought little of real value and is a practice worth discouraging.
Let the consumer spend by all means, but at least reduce the litter that comes with every purchase.