An exposed garment may be available in a combination that does not meet the needs of the customer. To read the offer you must therefore observe sizes, fit and information, in addition to the number of models present. The product exists commercially, but may not be available to those looking for it.
I propose collecting unfulfilled requests without automatically turning them into lost sales. A person might seek only information or prefer an alternative. Registration serves to recognize a recurring need and to discuss future purchases.
The explanation of fit also matters. Understandable measures and indications help the customer to evaluate, especially at a distance. Generic formulas can leave uncertainty when different models of the same brand have different characteristics.
A hypothetical example is a store that receives many requests for a size that sold out early. Comparison with observed availability, reordering and demand period may suggest a change in quantities. The goal is not to guarantee each variant at all times, but to understand the absences that limit the service. Careful size management links assortment and inclusion in concrete experience, avoiding promises that stock cannot sustain.