Sell-through lives and dies on one size.
A style sells when the size the shopper wants is on the floor. Everything else is a rounding error. Clarity counts at item level, so the size curve on the shelf matches the one the buyer planned.
One or two stores, thirty days, no hardware or software cost.
A full rail can still be out of stock.
The stock file counts a style. The shopper wants a size. Those are different numbers, and only one of them decides whether the sale happens.
Broken size curves
A style shows healthy stock while the two sizes that actually sell are gone. Item-level counting sees the run, not the total.
Stockroom drift
Replenishment happens when someone notices a gap. The item was there the whole time, three meters away, in a box.
Markdown by guesswork
Terminal stock gets marked down on a number nobody trusts, so the discount is deeper than it needed to be.
Returns that vanish
A returned garment sits in a back-of-house pile for days before it is sellable again, during the exact week it would have sold.
The count is the merchandising decision.
Buyers, allocators, and store teams all act on the same stock number. When it is wrong, every one of those decisions is wrong in a different direction.
The same platform, a different problem.
Item-level accuracy is the constant. What differs is where the stock hides and which number decides the sale.
Count one store for thirty days.
One or two stores, your own stock, your own size curves. The findings are yours whether or not you go further.