Hey Kitty,
It's your fashion. But if your mother feels like there's something wrong with it, it's for a good reason. Miniskirts and such pose a threat for you because, well, in today's world, there are lots of guys around and, you know. Just ask your mother about her views and decide to compromise. One tight thing here, baggy blouse here, etc.
Peer pressure is affecting you, so don't let it do so!
-GemHeart