create implication boobplate -> breastplate
Since the boobplate tag is meant to be for particular kinds of breastplates (i.e. ones that only cover the breasts or are molded to the shape of the wearer's breasts), it would make sense for the implication.
EDIT: The tag implication boobplate -> breastplate (forum #145005) has been rejected by @Hillside_Moose.
Updated by DanbooruBot