Warp & Weft Explained: How Woven Fabric Is Built
In short: Every woven fabric is made of two sets of yarns. Warp runs lengthwise under tension on the loom; weft (filling) runs crosswise, woven over and under the warp. How fine those yarns are and how densely they're packed — the construction — decides a fabric's weight, density, drape and durability. Understanding it lets you read a fabric like a spec sheet.
Warp and weft, simply
Picture a loom: long yarns are stretched tight from front to back — that's the warp. A shuttle then carries another yarn side to side, weaving over and under the warp — that's the weft (also called filling or pick). A quick mnemonic: weft goes from the left, across; the warp runs the length. The way they interlace creates the weave — plain (poplin), diagonal (twill), basket (oxford) and so on.
How to read a fabric construction
Mills describe a fabric with a short code that captures the yarns and the density, for example: 2/100 × 2/100 / 100 × 90. The first part is the warp and weft yarn counts (here, 2-ply 100s in both), and the second part is the density:
| Term | Means | Effect |
|---|---|---|
| Ends (warp) | Lengthwise yarns | Form the fabric's backbone |
| Picks (weft) | Crosswise yarns | Fill the fabric |
| EPI (ends per inch) | Warp yarns per inch | Higher = denser warp-way |
| PPI (picks per inch) | Weft yarns per inch | Higher = denser weft-way |
Higher EPI and PPI generally mean a tighter, denser fabric; finer counts mean a lighter, smoother one. Together with GSM they fully describe the cloth.
Grain and why it matters
The grain is the direction of the yarns: lengthwise grain follows the warp, crosswise grain follows the weft, and the bias is the 45° diagonal (which stretches and drapes differently). Cutting a shirt on-grain keeps it hanging straight and true; off-grain cutting causes twisting and poor fit. The selvedge — the bound edge along both lengthwise sides — marks the warp direction and stops fraying.
Why construction matters for your shirt
- Density affects opacity, durability and how crisp or soft the fabric feels.
- Balance of warp and weft affects drape and stability.
- Consistency of construction across bulk is a key quality marker — see how to check fabric quality.
Where D BADAMI fits
D BADAMI controls construction in-house across poplin, twill, oxford, satin and dobby, weaving consistent, well-specified cloth at 120–160 GSM. See the range or order wholesale.
FAQ
Difference between warp and weft?
Warp runs lengthwise under tension; weft runs crosswise, woven over and under the warp.
What does fabric construction mean?
The yarn counts in warp and weft plus the density (ends per inch and picks per inch) — how the fabric is built.
What is EPI and PPI?
Ends per inch (warp yarns per inch) and picks per inch (weft yarns per inch); higher values mean a denser fabric.
What is the selvedge?
The finished, self-bound lengthwise edge that prevents fraying and marks the warp direction.
Related: Weaves · Yarn count · GSM · How to check fabric quality.