Most brand owners start sourcing shapewear by comparing suppliers. The more useful question comes earlier: which construction method actually fits your product.
Seamless and cut-and-sew aren’t two styles of the same thing. They’re two different manufacturing processes, and the process decides what your product can do, what it costs, and how fast you can launch it.
What seamless construction actually is
Seamless shapewear comes off a circular knitting machine as one continuous tube. No fabric panels, no side seams, no stitching to hold pieces together. The garment is knitted into its final shape directly from yarn.
Santoni machines are the standard here, and for good reason. The seamless garments market was valued at USD 3,125 million in 2025 and is projected to reach USD 5,362 million by 2032, growing at 9.3% annually (24M Research, 2025). That growth is mostly activewear and intimate apparel brands moving away from stitched construction because customers can feel the difference.
The build process shapes the result in three ways. No seams means no friction points against skin, which matters more than people expect once a buyer’s customer wears the product for eight hours. The knit is continuous, so compression zones get built into the fabric structure itself rather than added with separate panels. And because there’s no cutting or sewing labor per panel, unit cost drops once you’re at volume.
The tradeoff is tooling. A seamless machine is programmed for a specific shape and gauge, so the upfront setup cost is higher than cutting fabric off a roll. That setup cost is also why seamless production runs in fuller batches rather than small test orders. It’s part of why a custom seamless bodysuit takes more planning upfront than a cut-and-sew style, but pays off once you’re at volume.
What cut-and-sew construction actually is
Cut-and-sew starts with flat fabric, usually PowerNet or a similar compression textile, cut into panels and stitched together. This is closer to how most apparel gets made, and it’s the method behind structured pieces like high-compression fajas, waist trainers, and post-surgical garments.
Panels mean control. You can layer different fabric weights in different zones, add boning channels, build in zippers and hook-and-eye closures, and create asymmetric compression that a single knit can’t replicate. If a product needs targeted, high-pressure shaping in one area and flexibility in another, cut-and-sew is how you get there.
It’s also the more accessible entry point for custom development. Because the fabric is sourced by the roll rather than knitted to spec, order volumes tend to start smaller than seamless. You’re not paying for machine programming, you’re paying for cutting and sewing labor, which scales differently.
The limit is the seam itself. Even well-finished cut-and-sew garments have stitch lines, and on premium or everyday-wear products where invisibility under clothing matters, that’s a real constraint.
Matching construction to your product, not the other way around
Buyers sometimes pick a construction method because a competitor uses it, then try to force their product into that mold. That backfires both ways.
Trying to get post-surgical compression levels out of a seamless knit means stacking yarn density until the fabric loses stretch and comfort, the two things seamless is supposed to deliver. Trying to make an everyday smoothing bodysuit invisible under clothing using cut-and-sew means fighting the seam lines the whole way.
A useful filter: if the product needs zone-specific structure, boning, or closures, start with cut-and-sew. If it needs to disappear under clothing and the compression level is moderate to firm but uniform, seamless is the better fit.
Fabric composition follows the same logic. Our seamless base fabric runs an 80% nylon, 20% spandex blend for everyday compression, moving to 88% nylon, 12% spandex with cooling yarn for performance lines. Cut-and-sew styles typically use PowerNet with reinforced elastic channels for higher, more localized compression. Neither composition is better, they’re built for different jobs.
What this means for your product line
The real value of knowing both methods isn’t supplier vetting, it’s what it lets you build. A brand sourcing from a factory that only does one construction type is limited to one kind of product story. A brand sourcing from a factory that does both can serve very different customer needs from the same catalog.
Seamless opens up the everyday-wear, fashion-forward side of the market: bodysuits worn as outerwear, smoothing layers under going-out dresses, the kind of product where comfort and invisibility are the selling point. Cut-and-sew opens up the structured, high-compression side: post-surgical garments, firm-control fajas, products where the customer is paying for visible, engineered support.
Most growing brands eventually want both, because their customers aren’t one type of buyer. Someone shopping for a daily smoothing layer and someone shopping for serious waist control are different customers with different expectations, and trying to serve both with one construction method usually means compromising on one side.
Sourcing both from a single factory means one tech pack process, one quality standard, one relationship to manage, instead of splitting your line across two suppliers who each only do half of what you need.
Summary
Seamless and cut-and-sew aren’t a quality ranking, they’re two different tools that open up different parts of the market. Pick based on what the product needs to do on a body, and pick a factory that can build both, so your catalog can grow into both directions without adding a second supplier relationship. You can see what that looks like across our seamless bodysuit collection.
