'twill (archaic or dialect) a contraction of it will

twill¹ /twil/, or (Scot) tweel /twēl/

1. A woven fabric showing diagonal lines, the weft yarns having been worked over one and under two or more warp yarns
2. The appearance so produced

To weave with a twill

cavalry twill

A strong woollen twill used esp for trousers

twilled /twilˈid/ (Shakespeare)

1. Prob, protected against floods by plaited osiers (the word so used still at Stratford)
2. According to some, ridged like twilled cloth
3. Or reedy, from an alleged obsolete word twill a reed

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