Size Curve
A size curve is the distribution of demand across sizes for a style or category — for example, what share of units sell in S, M, L, XL. Buying and replenishing to the right curve is what keeps core sizes in stock through the season.
Aggregate sell-through can look healthy while the core sizes have been out of stock for weeks — the size curve is where that truth lives. A size-level view turns “the style sold through” into “we lost the middle of the run early.”
Pack configurations and reorders should both track the curve, not an even split across sizes.
See also
RetailNorthstar puts these metrics where planning decisions happen — connected to one plan, live against actuals.
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