The bulk update request #4518 is pending approval.

create alias tentacle_clothing (55) -> tentaclothes (182)
create alias tentacle_suit (44) -> tentaclothes (182)

Reason: All three tags are used to refer to clothing comprised of tentacles. They share this description on both their individual wiki pages and the tentacles tag list (in which they’re listed alongside each other on the same line).
Out of these three, tentaclothes currently has the most posts tagged with it.