A weave structure is the systematic arrangement of warp-over-weft and weft-over-warp intersections that determines a fabric's visual appearance, mechanical behavior, and surface texture. In handloom weaving, this structure is encoded in a draft — a notational shorthand specifying threading order, shaft-to-treadle connections (the tie-up), and the treadling sequence.
The Weaving Draft
A weaving draft has four components arranged in a standard grid layout:
- Threading draft: Shows which shaft each warp end is threaded through, reading from right to left. A mark in column 3 of shaft row 2 means the third warp end from the right passes through a heddle on shaft 2.
- Tie-up: A grid showing which shafts each treadle lifts. In a direct tie-up, each treadle is connected to a single shaft. In a compound tie-up, treadles lift combinations of shafts.
- Treadling: The sequence in which treadles are pressed, read from top to bottom. Each row represents one weft pick.
- Draw-down: The resulting weave structure, derived by combining threading, tie-up, and treadling. Filled cells show where warp is on top; empty cells show where weft is on top.
In Polish weaving notation and older Central European drafts, the grid orientation sometimes differs from the American convention: threading may read left to right, and the tie-up may appear at lower left rather than upper right. Cross-checking orientation before interpreting any draft is essential.
Tabby (Plain Weave)
Tabby is the simplest possible interlacement: each warp end alternates over and under each weft pick. On a four-shaft loom, a standard tabby threading places odd-numbered ends on shafts 1 and 3, and even-numbered ends on shafts 2 and 4. Treadling alternates between a treadle lifting shafts 1 and 3, and a treadle lifting shafts 2 and 4.
Tabby produces a balanced, dimensionally stable fabric when warp and weft are set at equal density. It is the base structure for many complex supplementary-weft patterns: the ground weave runs in tabby while pattern picks use a heavier or contrasting yarn that floats over groups of warp threads.
Twill
Twill is defined by weft floats (or warp floats) that progress diagonally across the fabric surface, creating a visible diagonal line called the twill line. The most common twill is the 2/2 twill, in which the weft passes over two warp threads and under two, with the sequence offset by one thread per pick.
On a four-shaft loom, a straight draw threading (1, 2, 3, 4, 1, 2, 3, 4…) with a standard twill tie-up and advancing treadling produces a 2/2 twill with a 45-degree diagonal. Reversing the treadling direction creates a V-shaped herringbone. Alternating blocks of S-twill and Z-twill within a single threading creates a broken twill or chevron.
Twill Variations on Four Shafts
| Structure | Float Ratio | Appearance | Typical Use |
|---|---|---|---|
| 2/2 twill | Even (warp = weft) | Strong 45° diagonal | Woolen cloth, blankets |
| 3/1 twill | Warp-faced | Steep diagonal, smooth face | Sturdy cloth, bags, jeans-weight |
| 1/3 twill | Weft-faced | Steep diagonal, smooth back | Upholstery, decorative cloth |
| Herringbone | Even | Mirrored V diagonals | Suiting-style fabric |
| Broken twill | Even | Interrupted diagonal, texture | Tweed, decorative yardage |
Block Structures
Block weaves divide the warp into groups called blocks, where each block can be woven in one of two (or more) states: for example, warp-up (warp-faced) or weft-up (weft-faced). The threading allocates specific shafts to each block, and the tie-up determines which blocks are active on any given pick.
M's and O's, huck lace, and log cabin are common four-shaft block structures found in Polish regional weaving traditions. Log cabin, in particular, produces a strong color-striped effect by alternating two colors in both warp and weft within a plain-weave threading, with adjacent threads on different shafts. The visual result depends on the color arrangement rather than the thread interlacement, making it one of the few weave structures where the draft alone does not describe the final appearance.
Overshot
Overshot is a supplementary-weft structure traditionally used in North American and Northern European pattern weaving. It consists of a plain-weave tabby ground alternating with pattern picks in which the weft floats over groups of raised warp threads. The float length depends on the block grouping: longer floats create larger pattern areas but reduce structural stability.
In the Polish context, a similar supplementary-weft approach appears in kilim-style flat-weave tapestry and in the patterned towels (ręczniki) of the Łowicz region, where geometric pattern repeats in contrasting weft colors were woven on four-shaft looms using a modified overshot-like approach with short floats to maintain fabric durability.
Pattern Notation and Repeats
A weave repeat is the smallest unit of threading and treadling that, when tiled horizontally and vertically, produces the complete pattern. Identifying the repeat allows a weaver to calculate warp requirements, adjust the pattern to a different cloth width, and predict how colour variations in warp or weft will interact with the structural repeat.
In the simplest case — a 2/2 twill on four shafts — the threading repeat is four ends and the treadling repeat is four picks. In a complex overshot pattern the threading repeat may be forty or more ends, with a treadling sequence of corresponding length. Recording drafts accurately, including thread count per block and treadling sequence, is the practical foundation of pattern construction in handweaving.
Further reading: Wikipedia: Twill — Wikipedia: Weaving — Wikipedia: Jan Szczepanik