Thatís not entirely true. Yes they are sending out individuals to fight the Empire, but the slave bikini is up to the individual.
Of course it's up to the player.
But would it really make sense that the Trooper, who is a Republic soldier, isn't being told "Yeeeeaaaah...no Soldier. That will not keep you protected."
Same with the Agent, "Yeeeah. Slave bikini totally doesn't keep attention off you master spy."