Quick answer: A seamless machine makes texture by telling each needle what to do on each course: knit, tuck or skip. Out of that one control come ten structures you can put in a brief: plain jersey, rib, mesh, compression zones, jacquard, knit-in shading, double-layer zones, knit-in bands, colour bands and warm builds such as waffle. Brushing is added after knitting. Because each structure is only a different instruction in a different part of the same tube, one garment can carry several of them with no seams between.
The structures at a glance
| Structure | Looks and feels like | How it is knitted | Best for | What to tell the factory |
|---|---|---|---|---|
| Plain jersey | Smooth, even face; soft and matte with a fine yarn | Every needle knits every course | Leggings and bras where the yarn does the work | Hand-feel target, shade, opaque in a squat |
| Rib | Vertical columns; colour reads slightly deeper | Needles chosen column by column; a true rib needs two needle beds | Sets, bralettes, statement leggings | Rib type, where it starts and stops, squat test on bottoms |
| Mesh | Small open holes; lighter and cooler | Tucked and skipped stitches open the loops in one zone | Back, underbust, behind the knee | Zones drawn on a flat sketch, in cm |
| Compression zone | Firmer, smoother hold in one area | Tighter stitches in that zone | Waist, under the seat, thigh | Where, and how firm in plain words |
| Jacquard | Logo or pattern, matte on shine or two colours | Needle selection draws the artwork | Waistband marks, repeat patterns | Vector artwork, letter height, a low-stretch position |
| Knit-in shading | Darker or denser lines that shape the eye | Density or structure change along a drawn line | Seat contour, V-back lines | The line on a sketch, sizes to check it on |
| Double-layer zone | Thicker, more opaque, or an open sleeve | A second layer knitted in the same zone | Seat cover, pocket sleeve, bra front | Purpose (cover or pocket) and zone size |
| Knit-in band | Firm band without a sewn-in elastic | Denser courses at the top or under the bust | Waistbands, bra underbands | Band height in cm, firmness of the top edge |
| Colour bands | Horizontal stripes or blocks around the body | Yarn feed changes as the tube grows | Sporty stripes, tonal sets | Band heights; accept a soft edge |
| Warm builds | Waffle cells, or a soft brushed inside | Waffle is knitted; brushing comes after | Autumn and winter lines | Warmth target, weight, pilling test on the inside |
Plain jersey
Plain jersey is every needle knitting every course. It is the smoothest surface the machine makes, and most leggings and bras start from it.
Its feel comes from the yarn and the machine gauge rather than the structure. Fine, high-filament nylon on a fine gauge gives the soft, matte "buttery" hand. A coarser yarn on a coarser gauge feels sportier and shows more texture. That pairing is explained in the machine gauge guide and the buttery legging fabric guide.
Plain jersey is also where opacity is easiest to control. For a first light-coloured legging we would keep to this one structure. Our squat-proof guide sets the floor for light and nude shades at 240 GSM or more.
Rib
Rib is vertical columns. Our ribbed fabric guide covers four common versions: mini-rib, 1x1, 2x2 and drop-needle.
There are two ways to get the look, and they behave differently. A true rib has loops facing both ways, which needs needles on two beds. Machine makers build double knit seamless machines for exactly this; Santoni's page for its SMDJ-2T says it can "knit all different types of rib". A single jersey machine has one bed, so it builds a rib look by selecting needles column by column. Both read as rib on the body. A true rib usually stretches further across the width. Ask which one your sample is.
Rib opens up when stretched. Our guide runs rib bottoms 10–20 GSM heavier than the flat-knit version for that reason, and finer ribs suit leggings better than wide ones.
Mesh and open zones
Mesh on a seamless garment is not a separate fabric sewn in. The machine opens the loop pattern in one zone with tucked and skipped stitches, then closes it again at the edges. Our homepage describes the air-mesh family as an "ultralight knit for ventilation panels and breathable tops".
Placement is the whole spec. Back, underbust, inside the elbow and behind the knee all work. The seat and front rise don't, because an open structure is the opposite of what a squat test needs. Draw the zones on a flat sketch with measurements. "Breathable" on its own tells the programmer nothing.
Compression and density zones
A compression zone is the same yarn knitted tighter. Next to it, looser settings let the body move. Typical placements are firmer through the waist and seat, lighter behind the knee. Levels, fit tests and failure modes are in our compression guide.
Write down which zones and how firm, in plain words, then agree on the first sample what "medium" means. And ask for every size to be fit-tested in motion. A zone placed for a size M sits lower on an XS and higher on an XL unless it is graded.
Jacquard
Jacquard uses individual needle selection to draw artwork into the fabric. The usual versions are tone-on-tone (matte mark on a shiny ground, or the reverse), two-colour, and a texture change such as rib on flat. It can't crack or peel, because it is the fabric.
The limits are about resolution. Our knit-in logo guide puts the practical minimum letter height at about 5–8 mm depending on gauge, and keeps most programmes to two shades. Place the mark where the fabric stretches least, such as the back waistband. On the front of the thigh it distorts.
Knit-in shading and contour lines
Shading uses the same needle control as jacquard, but it draws lines and darker areas instead of a logo. A denser or matte band along a curve reads as a shadow. The seat looks rounder, or a V-line shows at the back, without a sewn seam. It costs programming time, not extra material per piece.
The catch is fit. A contour line placed for one seat shape can sit oddly on another, so check it on more than one body and in more than one size. Booty contouring compares it with V-back seams and scrunch.
Double-layer zones
In some zones the machine knits a second layer behind the first. Over the seat, it adds cover to a lighter or paler legging; our squat-proof guide recommends knitted-in double-layer seat panels when a summer weight goes lighter. Left open at one edge, the second layer becomes a sleeve, one of three ways to put a phone pocket on a knitted leg (see pockets on seamless leggings).
It adds knitting work and warmth. On a hot-weather style, keep the double layer small.
Knit-in bands
Waistbands and bra underbands can be knitted as a denser zone instead of carrying a sewn elastic. A bralette underband is denser courses; a high-rise legging band is knitted firmer so it holds without heavy elastic. "Knit-in" doesn't always mean no stitching at all: waistbands, straps and openings can still need some sewing at finishing, as our technology guide explains.
Give the band height in cm and say whether the top edge should be firmer than the rest. For bra bands, see seamless bralettes.
Colour bands and stripes
Colour changes when the machine switches the yarn it feeds, so a change runs around the body as the tube grows. Wide horizontal stripes and tonal bands are easy. Crisp diagonals and geometric blocks are not, because the edge follows the knit path, not a pattern line. That design needs cut panels or a print; the capability limits guide explains where to send it instead.
One more thing to settle early. Seamless pieces are usually knitted undyed and dyed afterwards, so a knitted stripe needs either pre-dyed yarn or two yarns that take dye differently. Ask which route your sample uses. It changes the dye plan and the colour matching between a top and a legging.
Warm builds: waffle and brushed-back
Waffle is a knitted cell structure that traps air. Brushed-back is a different process. The tube is knitted first, then a brushing machine raises a soft pile on the inside. Our winter fabrics guide gives 260–320 GSM for brushed seamless builds and the calendar for autumn launches.
Brushing makes the inside face more likely to pill. Ask for the pilling test on that face as well as the outside.
Less common: terry loops
Some single jersey seamless machines can knit terry, a looped back face that adds cushioning. Santoni lists it for the SM8-TOP2V as "Terry possibility on request", which makes it a machine option rather than a standard feature. Don't design around terry until the factory confirms its machines have it.
Mixing structures in one garment
These structures can share one garment. A legging can have a knit-in band, a compression zone under the seat, rib down the legs, mesh behind the knee and a jacquard mark at the back waist, all from one tube. Each extra structure costs programming and sampling, not material.
For a first style we'd stop at two structures, three at most. Every boundary between zones is a place where stretch changes, and each one has to be checked in every size. Adding a new structure to a stock body also turns it into custom development, which changes the minimum.
Making these at Yesseam
Yesseam makes seamless leggings, sports bras, bralettes, yoga and pilates sets and ribbed seamless sets, with brushed or naked-feel finishes. Our fabric families are buttery nylon/spandex, air-mesh, rib-seamless and GRS recycled nylon/polyester. You can put your logo, labels and packaging on a proven style (private label), send a tech pack (OEM), or start from a reference, sketch or brief (ODM), through sampling to bulk. Minimums: "For eligible in-stock styles, the minimum is 50 garments in total without a logo or 100 garments in total with your own logo or labels. Mix available styles, colours and sizes. A two-piece set counts as two garments: 50 sets = 100 garments. Full custom OEM/ODM usually requires 300–500 garments per style per colour, depending on design, fabric and construction; custom knitted patterns generally require 500. Custom dyeing, fit changes and knit-in logos have separate development minimums." A new rib, mesh map or jacquard is a custom knitted pattern. If a stock style already has the structure you want, start there.
Sources
| Source | What it establishes here |
|---|---|
| Santoni: SMDJ-2T double knit seamless machine | machine maker's description of rib knitting with needles in cylinder and dial |
| Santoni: SM8-TOP2V single jersey seamless machine | needle-by-needle selection on a single jersey machine; terry as an option on request |
FAQ
What are the main types of seamless knit structure?
Plain jersey, rib, mesh, compression zones, jacquard, knit-in shading, double-layer zones, knit-in bands, colour bands and warm structures such as waffle. Brushing is a finish done after knitting, not a structure.
Can one seamless garment combine rib, mesh and compression?
Yes. Each one is a different needle instruction in a different zone of the same tube, so they join without seams. Keep a first style to two or three, because every zone boundary has to be fit-checked in every size.
Are rib and mesh see-through on leggings?
They let more light through under stretch than plain jersey of the same weight. Keep mesh off the seat and front rise, run rib bottoms heavier, and squat-test the sample under bright light.
What is the difference between jacquard and a print on seamless?
Jacquard is knitted into the fabric by needle selection, so it can't crack or peel, but it is limited to bold shapes and usually two shades. A print goes on after knitting and can carry photographic detail.
Does a new knit structure change the minimum order?
Usually, yes. A new rib, mesh map or jacquard is a custom knitted pattern, and custom knitted patterns generally require 500 garments per style per colour. A stock style that already has the structure keeps the stock minimums.
Is brushed fabric a knit structure?
No. The garment is knitted first and then brushed on the inside to raise a soft pile. Waffle, by contrast, is a structure knitted on the machine. Both are used for winter lines.