Use size mapping when
- The category supports cut-size or alteration logic.
- The team can define clear source-to-target rules.
- Inventory protection is part of the setup.
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Size mapping for fashion ecommerce works only when the workflow is real.
Good size mapping is narrow, understandable, and rooted in category operations. Bad size mapping is broad, theoretical, and likely to create support or fulfillment pain.
Do not use size mapping when
- The operational process cannot support the substitution.
- Merchants want a full-catalog shortcut.
- No one is willing to own rollout rules.