Square Knot / Sailor’s Knot

This is a way to tie an Overhand-Knot one each from the left and right and make a square knot. Historically, it can be confirmed by the Cravat-gentleman photograph after the 17th century. Also, after the 19th century it became a scarf knot used for European and American navy-uniform, it is also called Sailor's-Knot.