What you've said is: Looking only at the internalized costs, pointless-wasting a percentage of clothes costs X but reduces clothes cost in the store by Y, with Y being larger than X.
Okay. Irrelevant - that math doesn't include externalized costs. It may well be that this is a stupid idea, but "market decided destroying some clothes was more efficient" doesn't prove anything unless you can show that the size of the externalized costs to this process are 0 or close enough to 0 to have no meaningful relevance.