Collection Planning · September 18, 2026 · Viva Gymwear Editorial
Avoid dividing every size equally without evidence. Link size allocation to body measurements, fit review and your customer base.
A body-size chart tells shoppers which size to choose; a garment measurement sheet tells production and inspection what to check. Stretch leggings can have negative ease, meaning the garment is smaller than the body measurement, but the amount depends on material and intended fit. Do not compare flat waistband measurements directly with a body waist circumference and assume the numbers should match.
A sample in one base size does not prove the entire range. Changes between sizes affect rise, waistband, hip, thigh and length differently. Ask for the grading rules and inspect relevant smaller and larger sizes. Include movement and coverage checks, because a design that works at one size may create seam pressure or transparency elsewhere.
Existing customer orders, audience feedback, pre-launch interest and the target market can inform a size mix. When those signals are limited, use a deliberately small test and keep the hypothesis explicit. An illustrative 100-piece allocation might be 10 XS, 25 S, 30 M, 25 L and 10 XL; this is not a recommended universal ratio or a supplier-approved split. Change it to match your audience and quotation conditions.
Two colours and five sizes turn a single legging into ten variants. Adding a matching bra with a different size curve creates more planning work. Check whether shoppers can choose tops and bottoms independently rather than forcing the same labelled size. Avoid adding a second length or extra colours until you know which variants justify the inventory.
Track sales, exchanges, returns and the specific reason for size dissatisfaction. Distinguish a size-chart communication problem from a pattern problem. Ask customers which measurement or fit detail caused confusion. Update the chart and product description before placing a reorder, and reapprove the sample if the pattern changes. A better allocation comes from customer feedback, not a generic online size ratio.
That leaves too much uncertainty. Publish a reviewed body-size chart and keep production measurements internally.
Not necessarily. Your customer may need different sizes; decide the selling and inventory structure before ordering.
Send your styles, intended market, size range, colour choices, target quantity and delivery requirements. Ask us to confirm the applicable MOQ, sampling scope and quotation for your project.