Fold up Ohashori of inside to upside diagonally, and fix neckband again.
Arrange for the crease to be not seen when it's covered with left neckband.
This step is not always necessary.
But if doing like this, you can avoid a too much swell of Ohashori.
Bind your torso with Koshi-himo.
The start is under breast (upside of waist), cross on the back, and tie it at the front.
And, put tied cords into back of the cord.
Smooth out wrinkles of back.
Pull Ohashori down.
Pull the cloth from center to right and left.
Gather wrinkles into your side.
(Take care to keep nackband's shape.)
Cover a cloth from back's wrinkles with a cloth of front.
Like the following movie.
(It's a little exaggerated, but is a true motion.)
Smooth out wrinkles again and again with pulling back & front of Ohashori down & pulling the cloth to side.
Bind your torso with Date-jime.
The start is under breast (upside of waist / Sorry, a little higher than this photo), cross on the back, and tie it at the front.
And put tied belt into inside of cloth.