The second season is where accessory ranges usually lose coherence. The temptation is to add colours, sizes and formats because the first season sold, and the result is a shelf that no longer reads as one house. Extension works better along one axis at a time — more sizes in the established tone, or a second tone in the established sizes, rarely both.
From a production standpoint the constraint is material reservation. A second tone means a second reserved parcel and a second selection yield, which is a real cost that arrives before any of it sells. Extending within an existing batch costs almost nothing by comparison, which is why we usually propose it first.
We keep the first season’s reference strands specifically so an extension can be matched to what is already on the shelf rather than to a memory of it. That is the difference between a range that grows and a range that fragments.