The bulk update request #6798 is pending approval.

create implication hair_bun (8675) -> tied_hair (6587)
create implication pigtails (17481) -> tied_hair (6587)
create implication ponytail (70442) -> tied_hair (6587)

Reason: tied_hair is a tag that could get more use, all of those hairstyle feature tied hair by definition so tied_hair could become an umbrella term for all tied hairstyles.

That way, tied_hair could more prominently become the general tag for edge cases/more esoteric hairstyles that feature tied hair that aren't quite one of the main hairstyles.