Swimwear Size Chart Template

Swimwear shoppers are not deciding from a waist measurement alone. They are deciding whether a fabric will recover after swimming, whether a one-piece has enough torso length, whether a bikini top and bottom can be selected independently, and how much support or coverage the cut provides. A credible swimwear size chart makes those decisions visible before checkout instead of relying on a vague “runs small” sentence.

Use body measurements as the starting point

For most swimwear, the main table should clearly say that bust, waist, and hip ranges are body measurements, unless the store is intentionally publishing finished-garment dimensions. Mixing the two creates a common sizing error: shoppers compare their body to a garment measurement and conclude that an item is much smaller or larger than it is. If you publish garment dimensions, label where the garment was measured and whether the fabric was relaxed or stretched.

Use a tape around the fullest bust, the natural waist or product-defined waist position, and the fullest hip. Explain that the tape should be level and comfortable, not pulled tight. A product page can display centimetres and inches, but both need to come from one reviewed source rather than being maintained as separate tables.

Separate tops, bottoms, and one-pieces

Two-piece swimwear should not force every shopper into one combined size when the product allows mixed sets. A bikini top commonly depends on bust, underbust, cup support, and strap adjustment; a bottom depends more on waist, hip, rise, and preferred coverage. If the store sells them separately, show the relevant chart beside each selector. If a set must be sold together, state which measurement controls the fit and describe the compromise for customers whose top and bottom fall in different ranges.

One-pieces add torso length. A chart listing only bust, waist, and hip can be technically correct but incomplete for a long torso or a high-cut silhouette. Add a torso-length method, a note about adjustable straps, or an explicit recommendation to contact support when the shopper is at the upper end of the range. This is more useful than silently telling everyone to size up.

Explain stretch and intended compression

Stretch fabric is not one universal behaviour. Lined swimwear, compression fabric, ribbed fabric, underwire styles, and unlined fashion pieces can all require different ease. Add a concise fit note that names the intended feel: supportive compression, standard close fit, relaxed coverage, or adjustable fit. If the brand has tested the product after wet use, describe the relevant fact without making claims the product team cannot substantiate.

The decision rule should be specific. “Choose by hip for this fixed-waist bottom; the fabric stretches but the waistband is not adjustable” gives the shopper a method. “Choose by bust for this underwire top and use the strap adjustment for fine tuning” does the same. “True to size” does neither.

Design for a mobile product page

Keep the first table to the columns needed for the exact product; move detailed measurement methods and FAQ into a linked guide or expandable section. On a phone, preserve table type size and allow horizontal scrolling rather than reducing all values to a tiny image. A shopper should compare their numbers, choose a variant, and return to the size selector without losing their place.

Use the editor above to create a concise body-measurement table, then export it as Shopify Custom Liquid or general HTML. The exported chart is responsive, selectable, and editable. Replace the sample ranges with the approved ranges for the product family; do not reuse a bikini chart for a high-compression one-piece simply because both use XS–XL labels.

A practical storefront example

Consider a ribbed triangle top, a high-waist bottom, and a square-neck one-piece. The top needs bust and underbust guidance plus a note about adjustable straps. The bottom needs waist, hip, and coverage guidance. The one-piece needs bust, waist, hip, and torso-length guidance. A shared table can establish the brand’s body ranges, while each product adds only the note that changes the decision. This keeps the experience coherent without pretending every garment has the same fit.

Before publishing, have one person check the source measurements and another check storefront placement. Test the table with a narrow mobile viewport, verify that every selectable variant exists in the chart, and make sure support can see the same fit note. Repeat the check when a fabric, lining, or pattern changes.

Swimwear chart QA checklist

• State whether each value is a body or finished-garment measurement.
• Give tops, bottoms, and one-pieces different guidance when their fit drivers differ.
• Explain compression, lining, adjustment, and coverage in a product-specific note.
• Keep conversion values tied to one approved source.
• Keep the chart readable and reachable from the mobile size selector.
• Recheck the chart when construction, fabric, or variants change.