Shirt Flex Tab
Solving the Second Button Problem

Shirt Flex Tab is the small, smart detail that perfects shirt stance: a clean, confident line across collar, placket, and chest. A discreet flex point where shirts pull or gap keeps buttons aligned, the placket flat, and the silhouette sharp from first fitting to final look.As Jerry Seinfeld tells George Costanza in the first and last episodes of Seinfeld, “The second button is the key button. It literally makes or breaks the shirt.”Shirt Flex Tab gets it right every time, delivering comfortable movement without sacrificing polish.

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A small adjustment
A big difference

The Science of StanceIn menswear, stance is how a shirt frames the body: the vertical balance of collar, chest, and buttons. Get it wrong and the shirt gapes, pulls, or collapses. Get it right and the line stays clean, projecting confidence and style.Shirt Flex Tab is engineered for that balance. A discreet, flexible point of adjustment preserves the ideal stance while the shirt moves naturally with the wearer.The result:Buttons align as they should, without strain or sag.Collar and placket stay balanced for a sharp, symmetrical frame.The shirt adapts to sitting, walking, and reaching without losing shape.Shirt Flex Tab turns stiff garments into living ones; crisp, comfortable, and always in stance.

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Launch Shirt Flex Tab with Your Brand

Shirt Flex Tab is a patented, engineered solution from Shape Ventures. It is fully prototyped, wear tested, and design for manufacture ready to solve the second button problem and perfect shirt stance at scale.We moved beyond concept with functional elastomer prototypes, validated slot geometries, cycle and wash testing, and costed pilot builds across High Speed SLA and P3 with clear pathways to TPU and LSR for volume. The result is a discreet, premium upgrade that keeps collars, plackets, and buttons aligned while delivering all day comfort. It is an easy add to dress shirts, uniforms, and fashion capsules.We invite fashion brands to explore licensing and co development opportunities to bring this micro innovation to market quickly and credibly.