Abstract: A knitted rib or purl stitch fabric the ground structure of which has two faces of knitted loops drawn in respectively opposite directions. Courses of the loops of one face have inserted into them unknitted weft yarn contrasting with the ground structure. The inserted yarn is, without itself being knitted, knocked-over with knitted loops in spaced wales of said one face so as to be locked into the ground structure by virtue of being trapped between needle loops and adjacent sinker loops of both faces. Elsewhere the inserted yarn is floated across the fronts of knitted loops in intervening wales of said face and across the backs of oppositely drawn knitted loops of the other face.