In a twill weave, the weft travels over 1-3 warp ends and then passes under 1-3 ends. Each progressive row shifts by one warp end, creating a diagonal line across your cloth. Twill is generally woven on 4 shafts (though you see 3 shaft variations) and creates a strong and smooth fabric.
Weavings – TMurphy Textiled
Weaving with Knitting Yarn
Threading Part Two: Sett In A Multi-Heddle World - Yarnworker - Know-how for the rigid heddle loom
Step-By-Step: How To Weave
Basic Weave Structures: Twill - Gist Yarn
Looms Archives - Warped Fibers
Two slubby plies of US-grown cotton + 1 ply of European tow linen. A beautiful, textured yarn designed especially for weavers. Strong enough for warp,
Duet by GIST Yarns
Weave Structures: Crackle - GATHER Textiles Inc.
Ode Alpaca Weaving Yarn: Pretty Inside and Out