This is obtaining by breaking the twill line of a regular twill. It is somewhat similar in appearance Zigzag twill.
Broken twill can be obtained in different ways. 

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    At first basic twill is divided into two section, then the first section unchanged and the second section is reverse its order, that is to say if the basic twill is made up of 8 warp threads namely1,2,3,4,5,6,7,8 then its broken twill derivatives will obtain the order 1,2,3,48.7,6,5.
Broken draft is used in broken twill.

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