Use is made of at least two varieties of ultraviolet fluorescent yarns of different coloring obtained by spinning of a material loaded with a phosphor. Ultraviolet fluorescent yarns and infrared fluorescent yarns together with ordinary colorless yarns are warped and taken up on a beam or drum to thereby attain width-direction repeated disposing of ultraviolet fluorescent yarns in a specified color order. Subsequently, the ultraviolet fluorescent yarns and colorless yarns as the warp are woven by means of a wide loom. As a result, the ultraviolet fluorescent yarns and infrared fluorescent yarns are woven into a whole fabric in the specified color order in a parallel relationship. After the weaving, the wide woven fabric is heat cut at a tape width greater than the lateral-direction interval permitting discriminating of the color order of ultraviolet fluorescent yarns.