In fashion, the time available to sell can be a limited resource. A product consistent with the season can face difficulties if it comes too late or if it is proposed when the opportunity for use has already passed. The quantity purchased must be read together with the calendar.
I propose to distinguish the expected date of delivery, the start of the sale and the time beyond which the commercial conditions change. This reading allows to recognize delays that reduce the period of sale at ordinary price, even when the goods are delivered in full.
A hypothetical example is a garment designed for a seasonal occasion. Its performance must be compared with the actual sales window, avoiding to interpret few sales as just lack of interest. Climate, communication and size availability can also affect.
The review should link orders, arrivals and weekly trends, with consistent criteria across comparable seasons. It is then necessary to decide whether to adapt subsequent purchases, presentation or reordering times. Planning the calendar does not eliminate the uncertainty of demand, but makes visible the conditions under which the collection must produce its own result and the margins of intervention still available.