Knit Fabric Types Guide for Apparel Sourcing: Weft, Warp, and Common Structures
Why Knit Structure Is the First Decision in Apparel Sourcing
This knit fabric types guide for apparel sourcing starts with structure, because structure is the first decision: it determines stretch, recovery, drape, and hand feel before you choose fibre, colour, or finish. If you name the structure in your RFQ, every mill quotes the same fabric concept and your prices become comparable. If you leave it vague, you get quotes for different fabrics and no way to compare them.
Weft and warp are the two structural families that every other knit name sits under. Single jersey, rib, interlock, French terry, and fleece are weft structures. Tricot and raschel are warp structures. Once you know which family your garment needs, you can shortlist structures, weight bands, and finishing options without guessing.
Structure also constrains your sourcing plan. A warp knit programme needs different machinery and gauges than a weft programme, so mills quote them separately. Weight band, finishing route, and MOQ planning all follow from the structure you specify. Buyers who skip this step often discover late that their chosen structure cannot hit the target GSM or the required recovery.
This guide gives you the structural language mills use, a comparison table you can scan, and an RFQ checklist. It is written for sourcing managers and fabric developers building a seasonal knit brief, not for textile students.
Weft Knitting vs Warp Knitting: The Core Split
Weft knitting is the family you want for most apparel programmes: t-shirts, fleece, rib, and interlock. Warp knitting is the family for tricot and raschel structures used in lingerie, swim, lining, and technical applications. The split comes down to how the loops are formed.
In weft knitting, yarn runs horizontally across the fabric width, one continuous yarn per course, with loops formed across the width. This gives high crosswise stretch and a softer, more conforming hand, but the fabric can run or ravel more easily if a yarn is broken. In warp knitting, yarns run vertically, one yarn per wale, and loops are interlocked along the length. The result is more dimensional stability, less stretch, and a finer gauge.
A practical test: pull the fabric crosswise. High stretch and a curling cut edge usually signal weft. Low stretch, a flat cut edge, and a fine, dense surface usually signal warp. This test is not a substitute for a lab report, but it tells you which family you are holding before you ask the mill for a spec sheet.
| Structure | Family | Typical garment end use | Stretch / recovery | Typical weight band |
|---|---|---|---|---|
| Single jersey | Weft | T-shirts, tops, linings | Moderate crosswise stretch, limited recovery | Lower end of 180–360 GSM |
| 1x1 / 2x2 rib | Weft | Cuffs, collars, bodycon, trims | High crosswise stretch, good recovery | Mid range of 180–360 GSM |
| Interlock | Weft | Polos, heavier t-shirts, stable tops | Low-to-moderate stretch, stable | Mid-to-upper range of 180–360 GSM |
| French terry | Weft | Sweatshirts, joggers, mid-weight comfort wear | Moderate stretch, moderate recovery | Mid-to-upper range of 180–360 GSM |
| Fleece | Weft | Hoodies, winter basics | Moderate stretch, moderate recovery | Upper end of 180–360 GSM |
| Jacquard / textured | Weft | Statement panels, premium surfaces | Varies with base structure | Varies within 180–360 GSM |
| Tricot | Warp | Lingerie, lining, light technical layers | Low stretch, high stability | Lightweight end of 180–360 GSM |
| Raschel | Warp | Mesh, lace effects, netting | Low stretch, engineered openness | Varies within 180–360 GSM |
Use this table to shortlist two or three structures before you contact mills. It will not replace a sample, but it stops you from briefing a warp structure for a garment that needs weft stretch.
Common Weft Structures Buyers Actually Specify
Single jersey, rib, interlock, French terry, and fleece cover the majority of weft apparel programmes. Each one has a distinct face and back, and each one behaves differently in the same composition and weight.
Single jersey has one face and one back, is light and draping, and is the default for t-shirts, tops, and linings. It stretches crosswise but recovers less than rib, so it is not the right choice for a garment that must hold its shape tightly.
Rib (1x1, 2x2) alternates knit and purl wales, giving high crosswise stretch and good recovery. It is the structure for cuffs, collars, and bodycon garments. If your garment needs to snap back after stretching, rib is usually the answer.
Interlock has two interlocked jersey faces, so it is stable and opaque on both sides. It is used for polos and heavier t-shirts where a single jersey would be too light or too transparent. For a deeper comparison, see our guide to interlock vs jersey knit fabric.
French terry has a jersey face with an uncut loop back. It is the mid-weight comfort structure for sweatshirts and joggers. Fleece is brushed or loop-raised on the back for warmth and a soft handle, used in hoodies and winter basics. Jacquard and textured knits form the pattern in the knitting itself rather than by printing, which is why they are specified for statement panels and premium surfaces.
When you read a supplier spec sheet, the structure name tells you which of these behaviours to expect. If the sheet says “single jersey” but the garment needs recovery, you have the wrong structure, not the wrong colour.
Common Warp Structures and Where They Fit
Tricot and raschel are the two warp structures most buyers encounter, and they fit garments where stability matters more than stretch. Tricot is fine, smooth, and low-stretch, used in lingerie, lining, and light technical layers. Raschel is more open and engineered, used for mesh, lace effects, and netting.
Warp knits hold shape better and resist running, which matters for close-fit and performance garments. If your garment needs engineered stretch zones or mesh panels, ask for warp options early in development. Warp programmes usually need different machinery and gauges than weft, so they are quoted separately and may sit with a different supplier.
This is also where buyers get caught by naming. A mill may list “warp knit” as a category on its site, but the specific structure (tricot or raschel) determines the hand, the weight, and the finishing route. Ask for the structure name, not just the family.
For a broader view of how structures map to garment categories, see our knit fabric selection by garment category guide. It walks through the same decision from the garment side, which is useful when your design team gives you a silhouette before a fabric spec.
If you are still building the family-level vocabulary, start with our knit fabric basics: weft and warp classification article. It covers the loop formation mechanics behind the table above.
How Structure Maps to Garment Category and Weight
Structure and weight must be specified together, because the same structure name at two weights is two different fabrics. Lightweight tops and t-shirts typically sit at the lower end of the 180–360 GSM band, while fleece and warm-handle knits sit at the upper end. If you only name the structure, the mill will choose a weight for you, and it may not be the one your garment needs.
Stretch garments need a structure with inherent recovery, such as rib or an interlock with spandex, rather than relying on finishing alone. Composition interacts with structure: 100% combed cotton, 60/40 cotton-poly, and 85/15 cotton-spandex each behave differently in the same structure. A 1x1 rib in 100% combed cotton and a 1x1 rib in 85/15 cotton-spandex are not interchangeable.
Functional finishes such as wicking, one-way wicking, anti-odor/anti-bacterial, thermo regulation, windproof, water repellent, cooling, thermal, and recycled/eco-friendly are applied on top of a structure, not instead of choosing the right one. A cooling finish on a fleece structure will not turn it into a summer fabric.
| Garment category | Likely structure family | Likely structure | Weight band within 180–360 GSM |
|---|---|---|---|
| T-shirts and light tops | Weft | Single jersey | Lower end |
| Polos and stable tops | Weft | Interlock | Mid-to-upper range |
| Cuffs, collars, bodycon | Weft | 1x1 / 2x2 rib | Mid range |
| Sweatshirts and joggers | Weft | French terry | Mid-to-upper range |
| Hoodies and winter basics | Weft | Fleece | Upper end |
| Lingerie, lining, light technical | Warp | Tricot | Lightweight end |
| Mesh and netting | Warp | Raschel | Varies |
Use this table as a starting point, then confirm the exact GSM with your mill. The structure name and the GSM together are the minimum viable fabric spec.
What to Put in Your RFQ So the Mill Quotes the Right Structure
A complete RFQ names the structure family, the specific structure, the target GSM, the composition, the width, and the required stretch and recovery direction. Without these, mills quote different fabrics and your comparison is meaningless.
Start with the family: weft or warp. Then name the structure: single jersey, 1x1 rib, interlock, French terry, fleece, tricot, or raschel. State the target GSM within the 180–360 GSM range, the composition (for example 100% combed cotton, 60/40 cotton-poly, or 85/15 cotton-spandex), and the width. Add the garment end use and the finishing you expect, such as brushing, calendering, or a functional treatment.
Ask for the sample first. Sampling runs 15–30 days and bulk production runs 35–45 days, so a structure change late in the calendar is expensive. Plan MOQ around 500 kg per colour and 2,000 kg per order, and confirm QC expectations such as AQL 2.5 inspection.
A mill with in-house knitting, dyeing, and finishing can usually resolve structure questions faster than a trading intermediary, because the knitting, dyeing, and finishing teams sit in the same operation. yxxfabric.com runs factory-direct operations with own knitting, dyeing, and finishing across three integrated plants covering 30,000 m², with 200+ circular knitting machines, an in-house dye house, and a finishing plant for brushing, calendering, and special treatments. Monthly capacity is 1,000 tons, and the company holds OEKO-TEX Standard 100 and ISO 9001 certifications.
FAQ
What is the difference between weft knit and warp knit fabric? Weft knit fabric is formed with yarn running horizontally across the width, one continuous yarn per course, which gives high crosswise stretch and a softer hand. Warp knit fabric is formed with yarns running vertically, one yarn per wale, which gives more dimensional stability and less stretch. Most t-shirt, fleece, rib, and interlock programmes are weft; tricot and raschel are warp.
What are the most common knit fabric types used in apparel? The most common weft structures are single jersey, rib, interlock, French terry, fleece, and jacquard. The most common warp structures are tricot and raschel. Single jersey covers t-shirts and tops, rib covers cuffs and bodycon, interlock covers polos, French terry covers sweatshirts and joggers, and fleece covers hoodies and winter basics.
Is single jersey the same as weft knit? No. Single jersey is one specific weft structure, not the whole family. Weft knit is the family that includes single jersey, rib, interlock, French terry, fleece, and jacquard. When a supplier writes “single jersey” on a spec sheet, they are naming one structure within the weft family, not the family itself.
Which knit fabric is best for t-shirts and which for sweatshirts? For t-shirts, single jersey is the default structure, usually at the lower end of the 180–360 GSM band. For sweatshirts, French terry is the standard mid-weight choice, with fleece at the upper end for warmer hand feel. If the t-shirt needs to hold shape tightly, consider interlock instead of single jersey.
How do I specify knit fabric structure to a supplier in an RFQ? Name the family (weft or warp), the specific structure (for example 1x1 rib or French terry), the target GSM within 180–360 GSM, the composition, the width, and the required stretch and recovery direction. Add the garment end use and expected finishing. Ask for a sample first, since sampling runs 15–30 days and bulk production 35–45 days.
References
- Knit Fabric Basics: Weft and Warp Classification
- Knit Fabric Selection by Garment Category
- Interlock vs Jersey Knit Fabric
- EYSAN FABRICS: A Beginner’s Guide to Knit Fabric Send us your structure, target GSM, composition, and garment end use, and we will confirm the right knit and send a sample for evaluation. Quotes follow the sample, so you can compare like for like.