Drawing out a sword from the chest in Japanese culture

Question for orientalists. In some anime, manga or other works that refer to Japanese culture I met some characters, mostly female, that drawing a sword from theirs chests. Is there any cultural background of this or it’s just a popular trope based on nothing?

https://www.reddit.com/r/japan/comments/105tm0c/drawing_out_a_sword_from_the_chest_in_japanese/

2 comments
  1. It’s a legit thing; you can even still see sumo’s tate-gyōji with such tantō on their persons.

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