Line Planning

Line planning is the pre-assortment stage in apparel product development where brands establish the structural framework for a seasonal collection before individual styles are selected. It determines how many styles will be offered, in what categories, at which price tiers, and with what attribute composition — creating the parameters within which the assortment plan is built.

Line planning operates at a higher level of abstraction than assortment planning. While the assortment plan answers "which specific styles are we buying?", the line plan answers "how many styles are we buying, at what price points, and with what category balance?" The line plan is the architect's blueprint; the assortment plan is the construction schedule.

What line planning defines

Style count by category: How many tops, bottoms, outerwear, or accessories will the brand offer this season? Setting this before style selection prevents assortment creep — the tendency for brands to add styles beyond what the OTB, planning capacity, or floor space can support.

Price architecture: The distribution of styles across good, better, and best price tiers. A brand that plans to run 60% of its line at the better tier needs to make that decision before product development begins, not discover it after individual styles are priced.

Newness-to-carry-over ratio: What percentage of the line will be new introductions vs. proven carry-over styles? This ratio has direct implications for inventory risk (carry-overs have sell-through history; new introductions don't) and OTB allocation.

Attribute targets: Category-level targets for silhouette, fabrication, or color story before individual products are assigned to those targets.

Line planning vs assortment planning

| | Line Planning | Assortment Planning | |---|---|---| | Stage | Pre-development | Pre-buy | | Question | How is the collection structured? | Which specific products do we carry? | | Output | Style count, price tier, attribute targets | Style selection, depth, size curves |

Why line planning matters for OTB

A brand that defines its line structure before committing to specific styles can manage OTB at the structural level — ensuring that the total style count and planned depth by category stays within financial targets before any individual product decisions are locked.

Without line planning, OTB overages are discovered only after the assortment has been built — too late to reduce style count without reversing product development decisions.

RetailNorthstar supports line planning at the collection structure level, connecting style count and price tier targets to the OTB model before individual assortment decisions are made.