User blog comment:IamJakuhoRaikoben/Chapter 325: Unity, Review./@comment-4449950-20130329141016/@comment-4829046-20130330022514

I don't think the term "bra" applies much to the FT cast, since in most cases, they seem to lack them. The anime even edited out Lisanna's bra on Tenrou. The reason you "think" they wear bras is because the art style is meant for younger audiences.