The bulk update request #1237 is pending approval.

mass update feather_hat -> hat_feather
create alias feathered_cap (19) -> hat_feather (984)
create alias feathered_hat (1) -> hat_feather (984)
create implication feathered_headdress (144) -> headdress (4150)
create implication headdress (4150) -> headwear (229535)
create implication tricorne (115) -> hat (211034)
create implication bicorne (42) -> hat (211034)
remove implication hat_feather (984) -> headwear (229535)
create implication hat_feather (984) -> hat (211034)

Reason:

• Convert feather_hat, feathered_cap, feathered_hat to existing larger tag hat_feather.
• All current instances feature feathers in hats, and not headgear constructed primarily of feathers.
• Alias feathered_cap, feathered_hat to hat_feather; there may not be enough meaningful difference to maintain them as distinct tags.
• Create implication chain for feathered_headdress -> headdress -> headwear.
• Subsume tricorne and bicorne underneath hat.

Further discussion/outstanding issues:

• Should feather_hat be changed to invalid/disambiguation? (a la the suggestion in topic #29676)
• feather_hat has multiple potential interpretations, i.e. headwear made of feathers (feather_headdress) or a hat with a feather in it (hat_feather)

alias feather_hat -> feather_hat_(disambiguation)
category feather_hat_(disambiguation) -> invalid

* Should hat_feather implicate hat? (currently only implicates headwear)

imply hat_feather -> hat

[/s]
* Should feathered_cap and feathered_hat be aliased to or implicate hat_feather, or be left open for future use?

imply feathered_cap -> hat_feather
imply feathered_hat -> hat_feather

alias feathered_cap -> hat_feather
alias feathered_hat -> hat_feather

[/s]

An update will empty out the tag. If you want to permanently get rid of it, alias it instead.

Yes, and given how many similar tags are already aliased to hat_feather, it makes sense to do so.

The concern is whether there's enough meaningful difference to bother preserving them as separate tags, but it seems unlikely.

• I think it will be fine for feather_hat to be aliased to hat_feather. There doesn't seem to be any meaningful difference between the two tags; both tags seem to be synonyms of each other. Similarly, I think it's fine for feathered_cap and feathered_hat to be aliased to hat_feather. Any posts that are currently mistagged can be edited, and the correct tags can be added where they are applicable.
• I think it would be better for hat_feather to be implicated to hat instead of headwear, since that implication to hat would be more accurate than the current implication to headwear.

Here are some of edits that can be added to this BUR:

29446905 said:
create alias feathered_hat (56) -> hat_feather (546)

I think this should be the other way around. hat_feather reads like it's referring to the feather specifically, which may or may not be with the hat. But there's no way to distinguish whether it's a hat feather or some other kind of feather without it being part of the hat, where feathered_hat more clearly communicates being a hat that has one or more feathers.