Abstract: A method and apparatus for forming a highly arcuate or "fish mouth" seam in the open end portion of hosiery blanks to form the toe therein, and which comprises a disk rotatable about a vertical axis and having a plurality of pairs of cooperating clamping members disposed about the periphery thereof. The underlying clamping member of each pair is fixed to the disk, and the overlying clamping member is vertically movable as well as pivotable about an instantaneous axis which is parallel to the rotational axis of the disk. Thus the end portion of the hosiery to be seamed may be clamped between the plates as the disk is rotated, and the overlying clamping member and clamped hosiery blank then pivoted about the instantaneous axis as the hosiery passes a seaming machine, to thereby form a highly arcuate seam line therein.