I can say that thickNthin and coil yarns should not be wasted on even-weave. Hand-spun novelty yarns should be saved for pieces that are knit, crocheted or for over-shot/float weaving.
On the other hand, yarns that are naturally slightly irregular, like the majority of my hand spun, do shine in plain-weave. They introduce a mild irregularity that produces a textural tremolo to a piece. Like a fine singer's voice trembles around a note, so hand dyed and hand spun yarns tremble around a hue and grist producing a sense of depth and intensity that cannot be manufactured by mass production machinery.
