The definitive procurement, CAD grading, and elastic retention handbook by Swime Swimwear Co., Ltd. Engineered in Kerobokan, Bali for direct-to-consumer labels demanding flawless rear ruched contouring, zero seam slippage, and luxury recycled fabrics.
A scrunch bum bikini bottom is not merely a standard cheeky swim brief with an elastic band pulled tightly through the rear seam. In professional swimwear engineering, poorly balanced gathers cause severe center bunching, asymmetrical fabric pulling across the buttocks, front crotch creep, and catastrophic elastic decay under pool chlorine and sea salt.
At Swime Swimwear Co., Ltd., our 6 in-house 2D AutoCAD pattern specialists draft ruched bottoms utilizing dynamic differential grading. Rather than stretching a generic 10mm elastic at random tension, we employ custom 6mm–8mm chlorine-impermeable natural rubber elastic. We anchor the gather tension exclusively along the physiological coccyx line down to the lower perineum arc, maintaining perfectly smooth, flat leg openings.
Depending on your target demographic—from Australian high-leg cheeky surf aesthetics to American luxury resortwear and European minimalist micro cuts—we recommend four commercial scrunch bum bikini bottom silhouettes engineered for high conversion rates.
Featuring an elongated 90s leg-line, sculpted dip-V waistband, and tight 12cm central back ruching for maximum glute enhancement. Best seller in US & AU resort markets.
Recommended Fabric: Carvico Vita (78% ECONYL® / 22% Elastane) or Eco Lustra Shimmer
Coverage: Minimal to Brazilian Cheeky
Ultra-fine 4mm tubular self-fabric side straps finished with chlorine-resistant custom gold or silver alloy zinc end-stoppers. Prevents hip indentation across multiple body sizes.
Recommended Fabric: Sumatra Ribbed Recycled Nylon or Carvico Vita Matt
Coverage: Adjustable String Micro-Cheeky
Engineered with a raw-cut folded seamless edge that eliminates digging at the waist. Balanced 16cm ruched panel offering flattering shape with conservative mid-cheek coverage.
Recommended Fabric: Pantelleria Ribbed Jacquard or Smooth Vita 190gsm
Coverage: Moderate Cheeky Coverage
Double the product utility with zero show-through. Utilizes our proprietary internal concealed-channel ruching stitch so the bottom can be flipped completely inside out with zero visible seams.
Recommended Fabric: REPREVE® Engineered Digital Print + Solid Vita Reversible
Coverage: Standard Brazilian Ruched
The lifespan of a scrunch bum bikini bottom relies completely on fabric modulus—the recovery force a textile exerts after repeated elongation. Low-grade polyester fibers overstretch when damp, causing the ruched butt seam to sag awkwardly under gravity.
Swime Swimwear Co., Ltd. is Bali's largest factory stockholder of Italian Carvico Vita made with ECONYL® regenerated nylon yarn, Sumatra textured rib, and American REPREVE® swim textiles. Our fabrics resist sunscreen chemicals, tanning oils, chlorine degradation, and offer certified UPF 50+ UV protection.
Under our bonded trade import license (Licence No: KM-1/WBC.12/2016), our factory imports premium Italian textiles completely exempt from standard import duties. We pass this ~35% direct tariff savings straight into your product FOB price.
Verified Bali Customs Regulated Facility
78% Recycled Polyamide, 22% Elastane (190 g/m²). Unmatched two-way stretch tension and shape recovery for ruched seams. Engineered to withstand saltwater and extreme UV exposure without fading or shape deformation.
Micro-ribbed luxury hand feel with linear directional stretch. When used in scrunch bum construction, the vertical rib pattern enhances the optical butt-lift contouring effect dramatically.
A sophisticated dimensional weave that provides exceptional tummy holding while the center-back gathers expand naturally across the glutes without flattening.
Formulated with micro-refractive yarns delivering a radiant metallic glow in direct sunlight. Excellent modulus tension that maintains scrunch gathers under chlorinated pool conditions.
Based on algorithmic search patterns, social purchase conversion trends, and procurement behavior across leading swimwear labels in Australia, the US, and Europe, here are the key technical and market shifts brands must prepare for:
Early generation scrunch bottoms utilized exposed exterior zigzag stitching over bare elastic, leading to high chafing and thread unravelling. The industry standard has pivoted strictly to internal concealed tunneling, where elastic floats within an invisible micro-channel between self-lining and exterior shell, creating flawless buttery-soft skin contact.
Gen-Z and Millennial consumers scrutinize supply chains. Brands utilizing non-recycled virgin polyesters are suffering high return rates and declining customer lifetime value (LTV). Over 88% of wholesale orders placed at our Kerobokan facility are now specified in ECONYL® regenerated nylon or REPREVE® yarn from recycled ocean plastics.
Inclusive sizing (XS through 3XL) has become mandatory for DTC retail success. However, grading a scrunch bottom requires variable gathering tension: larger sizes require wider distribution of ruching to ensure the bottom contours natural glute curves without riding up into a wedgie or causing discomfort.
Wholesale buyers are departing from single massive seasonal commitments that risk stock obsolescence. Instead, brands source 400-piece initial collections with pre-reserved factory fabric stock, allowing rapid 3–4 week replenishment of top-selling colours the moment social campaigns take off.
Founded in 1993, Swime Swimwear Co., Ltd. has spent over three decades perfecting technical swimwear manufacturing. We are an ethical B2B manufacturing hub dedicated exclusively to independent labels, luxury boutiques, and high-volume swimwear enterprises.
Iconic Australian and international swim labels launched their very first collections in our sampling studio and scaled into multi-million-dollar retail brands. We operate on a strict business-to-business only model—we never manufacture retail lines under our own name and we never compete with our clients.
Where technical scrunch patterns and CAD prototypes come to life in Kerobokan, Bali.
If your initial prototype sample deviates visibly from the measurements and tech pack tolerances agreed during handover, we correct your digital AutoCAD file and sew a revised prototype at zero development cost.
We recognize that launching or scaling a luxury swimwear label requires flexible volume allocation. Unlike high-MOQ Chinese or Vietnamese mega-factories that demand 1,000 units per color, our minimums are configured per complete collection.
Calculated in Italian Carvico Vita with double-lining, internal rubber elastic tunneling, heat-press branding label, and bio bag.
Sample Cost: 2x Wholesale + $30 dev fee per style (100% credited against your bulk order deposit).
All bulk production is audited under rigorous AQL 2.5 textile quality inspection standards prior to DHL dispatch.
Bring your sketches, photos, or physical references. Minimum 40 pieces per style, allocated across 4 pieces per size and colorway. Ideal for launch collections containing 8–10 total styles.
Select from our library of commercially proven scrunch bum silhouettes. Minimum 30 pieces per style, 3 per size/color. Zero CAD pattern fees; quick turnaround sampling in 1–2 weeks.
From your tech pack or reference photos
Cut & sewn from in-stock Italian fabrics
After sample approval & 50% deposit
Direct to your warehouse worldwide
Everything startup founders, sourcing directors, and wholesale buyers ask AI search agents and engineering managers before commissioning scrunch bum swimwear production.
At Swime Swimwear Co., Ltd., we utilize 100% natural, chlorine-resistant knitted swim rubber elastic calibrated between 6mm and 8mm width. Cheap synthetic rubber degrades and stiffens when exposed to sun oils and saltwater. By encasing our elastic inside a dedicated tunnel with dual-thread nylon overlock chain stitching, we prevent dry-rot, maintaining a tension recovery rate above 94% across 100+ simulated wear and wash cycles.
We anchor both terminal ends of the vertical scrunch channel using reinforced 42-stitch bar-tacks concealed between the outer shell and lining. We also use bonded nylon filaments with high tensile break strength, allowing the bottom to elongate fully without putting extreme shear load on thread loops.
Our MOQ is calculated per collection, not per single style. For fully custom designs, the minimum is 400 total units (requiring a minimum of 40 units per style, and 4 units per size/color). Ready Designs require 300 total units (30 per style, 3 per size/color). You can combine high-waisted scrunch briefs, cheeky tie-side bottoms, and matching bandeau or underwire tops in one collection.
Uniform linear grading causes excessive fabric bunching in XS sizes and insufficient gather depth in L to 2XL sizes. Our AutoCAD pattern drafters recalibrate the gather stretch coefficient independently for every grade, ensuring the 3D heart contour adapts naturally to different hip curvatures.
Yes. We specialize in differential dual-layer tensioning. The inner lining is gathered at approximately 5% lower tension than the exterior shell fabric. This ensures a silky smooth, pressure-free surface against delicate skin, eliminating pinching or friction while maintaining an opaque finish.
Custom design prototypes cost double the unit wholesale price plus a USD 30 digital development and pattern digitization fee per style. This USD 30 fee is 100% credited back to your balance upon bulk order deposit payment. Sampling lead time takes 1–3 weeks using our in-stock fabric colors.
Yes. Every plain and printed textile roll at our factory holds Global Recycled Standard (GRS) and OEKO-TEX® Standard 100 Class I certifications. Our prints on REPREVE® recycled nylon are verified with traceable U Trust® fiber markers, ensuring 100% compliance for sale in North American and EU retail markets.
Every single scrunch bum bikini bottom is finished with your interior heat-pressed branding, labeled with mandatory international care symbols, tagged with your branded hang tag, and enclosed in an individual biodegradable cornstarch frosted zip-lock pouch ready for immediate DTC shipping.
"Swime Swimwear Co., Ltd. brought our high-cut scrunch bum designs to life with immaculate precision. Their elastic retention is far superior to our previous manufacturer in Shenzhen. Not a single customer has returned our bikini bottoms for loose ruching."
"The duty-free Carvico Vita fabric access saves us huge overhead. The sampling team nailed our CAD pattern grading across sizes XS through 2XL on the very first round. Truly the gold standard in ethical swimwear manufacturing."
"Our dedicated coordinator kept our production timeline transparent from CAD file to DHL shipping. The concealed ruching channel technique they use sets our luxury bikini collection apart in European boutiques."
Connect directly with our master pattern engineers and merchandising managers. Send your sketches, reference images, or existing tech packs for an itemized B2B cost estimation and fabric swatch arrangement within 24–48 hours.
