Wavy twills are also known as pointed twills. In these classes of twill weaves the twill progresses in one direction for half of the repeat and then is reversed for the next half of the repeat. The reversal of the twill may be done in a regular or irregular manner primarily considering the series of threads that predominate the face of the fabric. Thus warp way reversal is where the warp predominates over the weft and weft way reversal where the weft predominates over the warp.
ZigZag or Wavy Twills
These are also known as pointed twills. In these classes of twill weaves the twill progresses in one direction for half of the repeat and then is reversed for the next half of the repeat. The reversal of the twill may be done in a regular or irregular manner. Ideally, the reversal of the twill should be done considering the series of threads that predominate the face of the fabric. Thus warp way reversal is done in cases where the warp predominates over the weft and weft way reversal is done in cases where the weft predominates over the warp.
Herringbone Twills
In the case of these twills, the twill is reversed as in the case of pointed twills. However, the pointed effect is broken. This type of construction produces a distinct stripe effect and also prevents the formation of an extended float where the weave turns. In this aspect, the herringbone twills are considered to be more advantageous than the pointed twills.