What is obijime?

Obijime is the cord that holds the entire obi, and by proxy the whole outfit together. It is usually a woven rope that can be in one solid colour, various different colours, or even patterned. There are also different levels of formality for obijime, depending on certain variants (thickness, type of weave, gold/silver, patterns, etc). The thicker an obijime is, the more formal. Also, if there are gold and silver threads in an obijime, it is instantaneously formal.

The position of an obijime in an outfit is shown as follows, circled in green:

My collection of obijime: