Role in Fabric Shaping
The typical use for increases and decreases is to taper a flat piece of knitted fabric, e.g., in widening the sleeve of a sweater from the wrist to the biceps. However, increases and decreases can also be used to produce curvature, i.e., to make the knitted fabric cup (positive curvature) or gather (negative curvature); in woven fabrics, this curvature is produced with darts, flares and gussets. A great advantage of knitted fabrics is that they can be shaped nearly invisibly without seams or cutting (as woven fabrics must) with increases, decreases, and/or short rows.
Read more about this topic: Increase (knitting)
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