There's no right or wrong answer to this question - it's entirely up to personal preference! Some girls choose to wear their blazers open as a style statement, while others prefer to keep them closed for a more polished look. Ultimately, it's up to you to decide what feels best for you. There are a lot of different opinions on whether or not girls' blazers are supposed to be closed. Some people think that it looks better when they're closed, while others think that it's more comfortable to leave them open. Ultimately, it's up to the individual to decide what they want to do with their blazer.