twill 
(twĭl)
(twĭl)n.
1. A fabric with diagonal parallel ribs.
2. The weave used to produce such a fabric.
tr.v. twilled, twill·ing, twills
To weave (cloth) so as to produce a pattern of diagonal parallel ribs.
[Middle English twile, from Old English twilīc, woven of double thread; see dwo- in the Appendix of Indo-European roots.]