Ready-shaped butterfly is one of the Easy and short self-tie bow tie that is spread in modern times. Since the 20th century, it is considered as an improved design-pattern to make a Basic-bow-knot silhouette quickly. We propose 6.5cm-width as "modern" and 8cm-width as "classic". It is recommended for those who wish to tie a bow tie easily because it is sewn in the shape of a butterfly so that the knot will be ready right away.