The Buy Is Where Strategy
Becomes Inventory.
Every unit you commit to is a bet placed months before delivery. RetailNorthstar connects your OTB, assortment, and size decisions into one buy plan — so the bet is informed, not improvised.
Buy planning is the process of converting assortment decisions into structured purchase commitments — quantities by style, color, size, vendor, and channel, reconciled against the OTB budget in real time.
The anatomy of a buy plan
A buy plan is more than a quantity list. In RetailNorthstar, every buy plan captures six dimensions of the purchase commitment — all connected, all reconciled, in a single workflow.
Style
Every line in the buy plan is anchored to a specific style. Style-level decisions — carry-over vs new introduction, price point, category — drive the top-level structure.
Color
Colorways are planned within each style. Depth by color reflects sell-through history, trend weighting, and channel requirements.
Size
Size quantities are derived from stored size curves, applied automatically across all styles in the buy. No manual ratio entry for every SKU.
Channel
DTC, wholesale, and store quantities are split within the same buy plan — not maintained in separate files. Channel allocation logic is applied at the buy stage.
Vendor
Buy quantities are assigned to vendors with cost, lead time, and minimum order quantities tracked. Vendor splits across styles are visible in one view.
Cost
Unit cost and landed cost are captured per style-vendor combination. The buy plan rolls up to total cost commitment automatically — always reconciled against OTB.
What RetailNorthstar does in the buy planning workflow
Where spreadsheet buy planning breaks down
Spreadsheet-based buy planning works for small buying teams with simple seasonal buys. As assortment complexity grows — more styles, more vendors, more channels — four failure modes emerge consistently.
Assortment drift
When the assortment plan is updated after the buy plan is started, the buy plan goes stale. Reconciling the two is a manual step that usually happens the night before the buy review — if at all.
Size quantities entered per SKU
Without stored size curves, buyers enter size quantities manually for every style. On a 200-style buy, this is hundreds of manual entries — each a potential source of error.
OTB reconciled separately
The buy plan total and the OTB budget live in different files. Someone has to manually check that the buy does not exceed the budget — and that check often happens too late.
Vendor splits tracked manually
When styles are split across multiple vendors, tracking which vendor gets which quantities, at what cost, requires its own spreadsheet layer — one more thing to reconcile before the buy locks.
Buy planning is the handoff between strategy and commitment
In RetailNorthstar, buy planning is step three in a five-step connected workflow. It receives inputs from OTB and assortment planning, and feeds directly into allocation. Every connection is live — no manual handoffs.
The approved OTB position — by category and channel — defines how much the buy plan can commit. RetailNorthstar surfaces this constraint in the buy planning interface so buyers are always working within guardrails.
OTB Planning →The finalized assortment — which styles, colors, and depth targets — feeds directly into the buy plan. Style choices made in assortment planning appear in the buy plan automatically, no re-entry required.
Assortment Planning →For each style in the assortment, buyers specify channel splits, vendor assignments, and size curves. RetailNorthstar applies stored size ratios and calculates SKU-level quantities automatically.
As buy plan quantities are entered or adjusted, the OTB position updates immediately. Buyers see whether they are over or under budget at every point in the process — no separate reconciliation step.
Once the buy is finalized, confirmed quantities flow into the allocation planning workflow. Channel and door-level distribution is planned against the same buy data.
Allocation Planning →Buy planning questions
What is buy planning in apparel merchandising?
Buy planning in apparel merchandising is the process of converting assortment decisions into a structured purchase commitment. A buy plan specifies how many units of each style, color, and size to purchase — from which vendors, at what cost, and for which channels. The buy plan is the bridge between the assortment strategy (what to carry) and the purchase order (what to order). In RetailNorthstar, the buy plan is connected directly to the OTB budget and assortment plan, so changes to either update the buy automatically.
How does buy planning differ from assortment planning?
Assortment planning determines which styles and colors to carry in a season — the product mix and depth strategy. Buy planning takes those assortment decisions and converts them into specific purchase quantities by size, vendor, and channel. Assortment planning answers "what should we sell." Buy planning answers "how many units should we commit to, from whom, and for which channel." In RetailNorthstar, these two workflows are directly connected — assortment decisions flow into the buy plan without re-entry.
Can RetailNorthstar apply size curves automatically in the buy plan?
Yes. RetailNorthstar stores size curves by category, channel, and demographic segment. When building a buy plan, stored size ratios can be applied across all styles in the assortment in a single step — eliminating manual size quantity entry for every SKU. Size curves can be customized per style or overridden where historical data suggests a different ratio.
How does the buy plan stay in sync with the OTB budget?
In RetailNorthstar, the buy plan and OTB planning are connected in real time. As quantities are added or changed in the buy plan, the OTB position updates automatically. Buyers can see their remaining OTB budget at the category and total level throughout the buy planning process. If the buy plan exceeds OTB, the system surfaces the overage immediately — there is no separate reconciliation step.
See the buy plan in action.
Book a demo and walk through a live buy planning workflow — OTB connected to assortment, size curves applied automatically, vendor splits tracked in one place.