Socks with Opaque Regions and Smoothly-Neighboring Sheer Regions that are Free of Yarn Tails

A sock (610, 620, 630) comprising:

• an opaque fabric-region (611), that blocks passage of at least 90 percent of incoming light;
• immediately bordering and adjacent to
• a sheer fabric-region (612), that blocks passage of 25 to 75 percent of incoming light;
• wherein the opaque fabric-region (611) and the sheer fabric-region (612) are a continuous fabric structure that is seam-free and stitch-free,
• wherein connection regions (613, 614) between the opaque fabric-region (611) and the sheer fabric-region (612) lack any seams and lack any stitches and lack any glue and lack any adhesive material;
• wherein an inner side and also an outer side, of connection regions (613, 614) between the opaque fabric-region (611) and the sheer fabric-region (612), are smooth and flush and lack any uncut remainder yarns.