The oldest artifact with a knitted appearance is a type of sock. It is believed that socks and stockings were the first pieces produced using techniques similar to knitting. These socks were worked in Nålebinding, a technique of making fabric by creating multiple knots or loops with a single needle and thread. Many of these existing clothing items employed nålebinding techniques; some of them look very similar to true knitting, for example, 3rd-5th century CE Romano-Egyptian toe-socks. Several pieces, done in now obscure techniques, have been mistaken for knitting or crocheting.