Women are more mindful of their fashion sense than men.
Women are more careful of their fashion sense than men.
「男性より女性」→「Women more than men」
「おしゃれ(ファッションのセンス)」→「Fashion sense」
「気を遣う」→「To be mindful of, To be careful」
まとめて言いますと、
「Women are more mindful of their fashion sense than men.」
「Women are more careful of their fashion sense than men.」
と表現します。