Having just looked up Anita, I can see your dilemma. As for her clothes, well, given other designs here (looks at Rogues) they're not the most outlandish. Actually I think there was a pirate in Final Fantasy 12 who dressed similarly.

But as Tenhou and others have said, don't worry too much about getting one over the other. All you want is the ability which I should mention stacks with Monica's but doesn't stack with itself, so having two Thieves is rather pointless to be honest (unless collection) and even CC or AW them is pointless.