An optical fiber for preserving the plane of polarization including a cladding and a stress imparting part disposed in the cladding, the stress imparting part comprising a base material including B2O3. A garment may be a sleeved partial undergarment accessory that may be worn under an outer garment and may be removed without requiring removal of the outer garment. The method may be used to discriminate between an adult touch and a child touch and to selectively allow access to control functionality to adults and not to children. In addition, it is possible to reduce memory size \xd727 bits) and thereby reduce packaging area and attain lower cost.