Figuring out the decorative elements on a cosplay can be a challenge, there are often buttons, or fastens or just pretty bits that are stuck on in odd locations.
Orochi’s knot that appears on the front of her top was one such detail. It is
possible to just cut the loops and glue or tack them to look mostly correct. However, I approached this one from the idea that the artist likely drew it from a real knot, so I did a google search for a three loop frog knot, as it appears in the approximate location of a fasten.