The “warp” refers to the lengthwise threads of fabric when the material was woven on a loom. The “woof” refers to the cross-threads woven through the warp. Thus, the reference to warp and woof is a merism, indicating that if any part of the clothing is infected, it must be examined by the priest.
48 à la chaîne ou à la trame de lin, ou de laine, sur une peau ou sur quelque ouvrage de peau,