A picked-over sale rack tends to hold the smallest and largest sizes. That pattern is a direct consequence of how size quantities are ordered months before anything reaches the floor.
Sizes are ordered on a fixed curve
Retail buyers order a size ratio for each style, allocating more units to the middle of the range and fewer to the ends, based on historical sales rather than any individual store.
The ratio is applied to every store receiving the style, with limited adjustment for local differences in customer body size.
Where the local pattern differs from the national one, some sizes sell out immediately while others linger through every markdown stage.
Sell-through is uneven by design
Middle sizes sell fastest because they match the most customers. Those units clear at full price and never reach the reduced rack at all.
The ends of the range serve fewer people, so at any price a proportion remains unsold. The residue accumulates as the season progresses.
By final clearance, what remains reflects the mismatch between the ordered curve and the actual customer base rather than the appeal of the garment.
Restocking rarely fixes the gaps
Once a style is in its markdown phase, retailers usually stop reordering it. Committing to new stock of a garment already being discounted would defeat the purpose.
Gaps in the size range therefore stay open, which makes the rack look increasingly picked-over even when the total quantity is substantial.
Consolidation between stores can refill a range temporarily, though the combined stock still carries the same skew. Gathering the remainders of ten stores produces a larger pile of the same unsold sizes rather than a balanced run.
Vanity sizing distorts the picture
Labelled sizes drift over time and differ between brands, so the same number can fit differently across two garments hanging on the same rack.
A shopper who assumes a consistent size may skip items that would fit, reinforcing the impression that only unsuitable sizes remain.
Trying the neighbouring sizes on a reduced item is often the difference between an empty rack and a usable one.
Using the pattern rather than fighting it
Shoppers at the ends of the size range face less competition during clearance and consistently find better selection at the lowest prices.
Those in the middle sizes generally do better early, when the range is complete and the first markdown has just been applied.
Knowing which position you occupy turns the sale rack from a lottery into something closer to a schedule.