Currently Hadanugi_dousa implies open_kimono. Which goes all the way down the implication chain to kimono and then japanese_clothes.
The problem is when characters are striking the same 'pose' when wearing non-Japanese clothing. Examples are usually Chinese clothing:
- post #1407096
- post #3854457
- post #4118164 (should probably be tagged off_shoulder instead, as there is no martial implication)
...introducing irrelevant open_kimono, kimono and japanese_clothes tags in the process. That are... exceedingly troublesome to remove unless one knows (or can figure out) the whole implication chain and remove all four tags at once.
The hadanugi_dousa wiki does explain that it should be used for kimono examples only. But this can be a bit unintuitive as the term refers to the pose, and doesn't necessarily imply the need for a kimono. Any example that features a character wearing loose robe-like clothing with one shoulder off and striking a martial pose (with dragon tattoo exposed for good measure) will feel like hadanugi_dousa, for people who don't look at the wiki. And it might be somewhat common because it's kinda like a shared trope for Eastern martial arts and 'tough guys' in general. I suspect there may be more examples, just obscured by chinese_clothing and korean_clothing not being tagged properly.
So, should the hadanugi_dousa -> open_kimono implication be removed?
Strictly speaking, "Hadanugi dousa" should only be used when a character is performing kyuudo (Japanese archery), as it is a kyuudo-specific term. But this restrictive interpretation is going to be far less useful and be much harder to 'enforce'.
Edit:
More problematic posts (monk robes):
post #4582720, hadanugi_dousa monk_(granblue_fantasy).
One Eirin post:
post #2425399
Then there's this case of 'canonical' tagging:
post #4371625.
I suppose mistags do happen all the time for all tags, but most others don't have a... complicated 4-tag implication chain like that for hadanugi dousa, making it difficult to fix mistags. And another issue is that it might hard for people unfamiliar with Eastern clothing to tell a kimono apart from other similar robe-like clothings. This causes Chinese clothes and monk robes (the more traditional Buddhist kinds, not some Japanese ones that are also kimonos) to get mistagged with two kimono tags and japanese_clothing.
Updated