Obi fee - Obiryo

...In addition to the obi celebration in the fifth month of pregnancy, the obi-untying and obi-hajime ceremony at the Shichigosan celebration, and the under-obi celebration where a loincloth or loincloth is worn at the coming-of-age ceremony, obi are also used at marriage as a sign of the acquisition of a new status. In particular, obi are closely related to marriage, as they are believed to bind souls together. In some regions, men and women would exchange obi sashes through a matchmaker to announce their engagement, and even today, betrothal money is often given as a payment for the obi. There was also a custom of having a priest tie obi with the names of both men and women written on them on the festival day of Kashima Shrine, called the Hitachi obi, to tell the fortune of the relationship between the couple....

*Some of the terminology explanations that mention "obiryo" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…妊娠5ヵ月目の帯祝（おびいわい），七五三の祝いでの帯解きや帯始め，成年式として褌（ふんどし）や腰巻をつける下帯祝のほか，婚姻でも帯は新しい身分の獲得のしるしとして使われる。とくに帯には魂を結ぶものという面もあって婚姻とは縁が深く，仲人を通して男女が帯を贈りあって婚約とする地方もみられたし，今日でも結納金を帯料として贈ることが多い。また〈常陸帯（ひたちおび）〉といって，かつて鹿島神宮の祭日に男女の名を別々に書いた帯を神官に結んでもらい，男女の縁を占う風習もみられた。…

※「帯料」について言及している用語解説の一部を掲載しています。

出典｜株式会社平凡社世界大百科事典 第２版について | 情報