Free Knitting Pattern for Flip Flop Socks - These Bikinisocken liners are knit in stockinette with a separate opening for the big toe to keep your skin comfy under the sandal thong. Designed by Regia Design Team. Pictured projects by binel, ina, and irmi-M. Uses 40-50 yards of fingering weight yarn - great for scrap yarn. Sizes EU 32 - 35 / 36 - 39 / 40 - 43. Available in English and German.