Even if the female armors are the only ones that are bikinis it is STILL not misogynistic. It is STILL not objectifying.

mi·sog·y·ny
noun \mə-ˈsä-jə-nē\
Definition of MISOGYNY

: a hatred of women

ob·jec·ti·fy
verb \əb-ˈjek-tə-ˌfī\

: to treat (someone) as an object rather than as a person

The only people here treating the female characters as objects are the ones insisting that they're being objectified simply by wearing the revealing armor.