A swimsuit designed for regular swimming and one intended for beach leisure may look similar, but their performance requirements differ. Before development begins, the brand needs to define where and how the garment will be worn. This determines the choice of fabric, construction, bust support, and sample testing requirements.
What Issues Should Be Identified During Sample Testing?
When wet, the fabric may become see-through, the cups may shift, and the edges may dig into the body or pull away from it. During fittings, it is also important to check whether the swimsuit rides up when raising the arms and whether the intended coverage is maintained when bending forward.
For active swimming, freedom of movement and a secure fit are particularly important. An attractive silhouette in a static position is not enough to evaluate these qualities. It is also necessary to check whether the swimsuit retains its shape after following the recommended care instructions.
What Should the Manufacturer Consider?
The intended use of the style should be included in the tech pack: swimming in a pool, beachwear, active leisure, or a combination of several activities. If the design includes sleeves or closures, their construction should also be evaluated during movement.
Before approving the sample, the following elements should be checked:
- Fabric. Fabric weight, stretch recovery, and resistance to conditions relevant to the intended use, including chlorine, seawater, and sunlight.
- Lining. Required coverage areas, opacity when combined with the outer fabric, and the absence of unnecessary bulk or shifting between layers.
- Cups and support. Bust stability during movement, the performance of underbust support and side panels. The specific solution depends on the style and size range.
- Elastics. Fit around armholes, openings, and other finished edges. Elastic tension should be adjusted for each area.
- Back construction. Maintaining a secure fit when bending and swimming while allowing freedom of shoulder movement.
- Fit when wet. Garment shifting, changes in fit, and transparency during movement.
Why Are Fittings in the Smallest and Largest Sizes Important?
Size grading should account for the proportions of the style and its support requirements. In certain sizes, excess fabric, excessive tension, or insufficient support may appear even if these issues were not present in the base sample.
That is why size range testing should be planned separately. Fittings in the smallest and largest sizes help identify where patterns, elastics, or support elements need adjustment. The successful fit of one approved sample should not be assumed to apply to the entire size range.
What Should the Brand Receive from the Manufacturer?
Before development begins, the scope of work should be agreed upon, including material selection, construction solutions, patterns, size grading, samples, and fit testing. This helps clarify which stages the manufacturer is responsible for and which decisions require the brand’s approval.
When reviewing a sample, it is useful to understand the reasoning behind the chosen solutions: why a particular lining was selected, how the support is constructed, and what the wet fitting revealed. The next stage requires documented results and a clear list of necessary adjustments.
If you are developing swimwear for sports and leisure, the discussion should begin with the intended conditions of use and the requirements of the style.
