Clear and certain on purpose.
No matter what they used to wear or not girls naturally got the years of education through all type of clothing and the ways to full control those clothing.
As long as you described the situation she is already in full control of the environment and in knowledge of her dress so there is no chance she put herself in that situation without knowing or wanting
Though that does not mean that its a sign of anything. She may only wanted to tease you a little and see its affect on you. Again we all know that women are the naturally devils himself
