I don't think it's wise for a girl to wear a man's suit. Clothes are made to be sex-specific. Any man wearing a woman's jacket will look "off" (e.g. weird shoulder/waist proportions). Likewise, men's suits will look unnatural on a girl. Besides proportions, it's easy to tell whether a jacket or pants are mens or womens. You may be able to pass as a boy, but you don't want your interviewers to be confused. If your name is a girl's name, don't contradict that image by wearing men's clothing.
I'm sure there are options for women in your situation, though.
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