Omnichannel Assortment Planning: How to Stop Planning Each Channel in a Silo

The silo problem

Omnichannel assortment planning is the practice of planning product assortments across all sales channels — DTC e-commerce, wholesale accounts, owned retail stores, marketplaces, and pop-ups — from a single unified view, rather than building separate plans for each channel.

Most apparel brands don't do this. Instead, they plan each channel independently:

• →The DTC team builds an assortment for the website
• →The wholesale team builds assortments for each account
• →The marketplace team (if one exists) picks from whatever is left
• →Nobody coordinates inventory allocation across channels until it's too late

The result: duplicated planning effort, conflicting inventory commitments, and a total buy that's 15–20% larger than it needs to be because each channel built its own buffer.

Why channel silos form

Channel silos aren't usually intentional. They form because:

Different teams own different channels

The DTC merchandiser and the wholesale account manager have different goals, different tools, and different timelines. They rarely sit in the same meeting to reconcile their plans.

Different cadences

Wholesale orders are placed 4–6 months before the season. DTC assortment can be adjusted up to the week before launch. These different cadences make it hard to plan both from the same starting point.

Different data

DTC has real-time sell-through data. Wholesale has PO commitments and reorder patterns. Marketplace has its own analytics. Each channel has different visibility into demand — and different definitions of "what's selling."

Different margin structures

DTC sells at full retail margin. Wholesale sells at 50–55% off retail. Marketplace takes a commission. Planning a unified assortment requires understanding that the same product has different economics in each channel — and making allocation decisions accordingly.

The unified assortment framework

Unified doesn't mean identical. The goal is not to offer the same assortment everywhere — it's to plan from one master assortment with channel-specific views.

Step 1: Build the master assortment

Start with your full seasonal assortment — every style, every color, every size. This is the master plan. It includes:

• →Style/color/size matrix
• →Planned retail and wholesale price points
• →Margin targets by category
• →Core vs. fashion vs. test classification
• →Total planned units across all channels

Step 2: Apply channel allocation rules

From the master assortment, apply channel-specific rules:

• →DTC: Full assortment access, prioritize exclusive colorways, plan for higher sell-through targets
• →Wholesale: Account-specific subsets, honor minimums and exclusives, plan for standard delivery windows
• →Marketplace: Carryover styles and proven sellers, avoid cannibalizing DTC exclusives
• →Retail stores: Location-clustered assortments based on local demand patterns

Step 3: Reconcile against OTB

The sum of all channel allocations must reconcile against your OTB budget. This is where most brands discover their channel plans exceed their budget — because each channel was planned independently with its own optimistic assumptions.

If the sum exceeds OTB, you have three levers:

1. →Reduce depth — fewer units per style across all channels
2. →Reduce breadth — fewer styles (one in, one out)
3. →Shift channel mix — allocate more to higher-margin channels (typically DTC)

Step 4: Build in reallocation triggers

The initial allocation is a starting point. In-season, demand patterns will differ from plan. A style that's selling faster on DTC than wholesale needs inventory reallocation. Build trigger rules:

• →If DTC sell-through exceeds plan by 20%+ at week 3, reallocate from wholesale buffer
• →If a wholesale account is trending below PO commitment at week 6, flag for discussion
• →If marketplace demand exceeds allocated inventory, evaluate margin impact before increasing allocation

Common mistakes in omnichannel planning

Mistake 1: Planning channel mix before demand signals

Many brands set their channel mix at the beginning of the season (60% DTC, 30% wholesale, 10% marketplace) and treat it as fixed. But demand doesn't respect your channel plan. If DTC demand is stronger than expected, holding inventory for an underperforming wholesale account destroys margin.

Fix: Treat channel mix as a dynamic variable that's reviewed weekly, not a fixed input set at the beginning of the season.

Mistake 2: Channel exclusives that fragment inventory

Offering exclusive colorways or styles to specific channels feels like a smart differentiation strategy. But every exclusive fragments your inventory — you can't reallocate an "Amazon-exclusive" colorway to DTC even if Amazon demand disappoints.

Fix: Limit exclusives to 10–15% of the assortment. Make the core collection available everywhere. Use exclusives strategically, not as a default.

Mistake 3: Ignoring cross-channel cannibalization

If you sell the same product on your DTC site and on Amazon, some percentage of Amazon sales are customers who would have bought from you directly — at higher margin. Without measuring this, you can't optimize channel allocation.

Fix: Monitor DTC conversion rate before and after marketplace launch. Track overlapping SKU performance. Calculate net margin by channel after cannibalization.

Mistake 4: Separate size curves by channel

DTC and wholesale may have different size demand patterns (DTC skews toward extreme sizes because customers self-select; wholesale skews toward the middle because retailers order conservatively). Using a single size curve across channels leads to stockouts and excess in both.

Fix: Build channel-specific size curves from sell-through data. Apply them to channel-level allocations.

Where spreadsheets fail at omnichannel

Planning multiple channels in spreadsheets means:

• →Separate files for each channel (can't see the unified view)
• →Manual reconciliation across channel plans (takes hours, breaks weekly)
• →No automated reallocation when demand shifts
• →No real-time visibility into channel-level WOS or sell-through

A connected planning platform like RetailNorthstar maintains one master assortment with channel-specific allocation views — so you can see the unified picture and the channel detail in the same system, updated in real time.

Further reading

• →Localized Assortment Planning — extending omnichannel to location-specific planning
• →Allocation and Replenishment Best Practices — how to allocate across channels and stores
• →Assortment Planning for DTC Brands — DTC-specific planning considerations
• →Assortment Planning for Wholesale — wholesale channel planning
• →Scenario Planning for Retail — modeling different channel mix scenarios