How to make an effortless heko-obi musubi

I believe this the the standard choice for a knot when wearing a yukata.

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The most basic version you can make of this butterfly knot, Morowana musubi (諸わな結) heko version:
Hekoobi step 1

Hekoobi step 1

Hekoobi step 2

Hekoobi step 3

Hekoobi step 4

Hekoobi step 5

Hekoobi step 6

The original Japanese page where these images came from can be found at 男のきもの大全

A bit different and in my opinion a more stylish option:
Tying heko-obi step 1

Tying heko-obi step 1

Tying heko-obi step 2

Tying heko-obi step 3

Tying heko-obi step 4

Tying heko-obi step 5

Tying heko-obi step 6

Tying heko-obi step 7

Tying heko-obi step 8

The original Japanese page where these images came from can be found at Yukata Kistuke

Same version but explained by someone different:

1

Creating a stylish heko-obi 1

Secure your kimono with a koshihimo

2

Creating a stylish heko-obi 2

Creating a stylish heko-obi 3

Wrap the heko obi around you, leaving leaving about 40 ~ 50cm at one side

3

Creating a stylish heko-obi 4

Keep wrapping until you have approximately the same length left

4

Creating a stylish heko-obi 5

Creating a stylish heko-obi 6

Make a butterfly knot (same as you do with your shoelaces)

5

Creating a stylish heko-obi 7

Increase one part of the hanging down sections, decreasing the other part in length

6

Creating a stylish heko-obi 8

Creating a stylish heko-obi 9

Now pull the longer piece up through the knot and down again leaving the butterfly loops visible at the sides

7

Creating a stylish heko-obi 10

Rotate the heko-obi right to the back

8

Creating a stylish heko-obi 11

Adjust the obi so it forms a nice even band

9

Creating a stylish heko-obi 12

Pull down the front part with a jerk like you also do with a kakuobi

10

Creating a stylish heko-obi 13

When seen from the side make sure the belt in the front is lower than at the back

11

Creating a stylish heko-obi 14

Offset the knot from the center to create a chic appearance

The original Japanese page where these images came from can be found at Otokomonokata

Another way to wrap an heko-obi:
Creating a stylish heko-obi 1

Creating a stylish heko-obi 1

Creating a stylish heko-obi 2

Creating a stylish heko-obi 3

Creating a stylish heko-obi 4

Creating a stylish heko-obi 5

Creating a stylish heko-obi 6

Creating a stylish heko-obi 7

Creating a stylish heko-obi 8

Creating a stylish heko-obi 9

Creating a stylish heko-obi 10

Creating a stylish heko-obi 11

Creating a stylish heko-obi 12

The original Japanese page where these images came from can be found at Kimoni-wa-Fuku

Sometimes a video can explain better than words and drawings can convey.

youtube thumbnail of muriwana knot

浴衣の帯の結び方：兵児

youtube thumbnail of muriwana knot

京染卸商業組合　兵児（へこ）帯を使った帯の結び方

youtube thumbnail of muriwana knot

着物講座～兵児帯の締め方編～

youtube thumbnail of muriwana knot

浴衣の帯結び