Leg Twist and Skew in Denim
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also check this for a better understanding:…
http://blueowlworkshop.blogspot.de/2010/10/denim-glossary-right-hand-twill-vs-left.html
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Some interesting observations about leg skewing: http://loomstate.blogspot.be/2013/01/the-twisted-truth-leg-twist.html