Most Helpful Guy
Depends on your look and what kind of attractive you want to be.
If you have a passion or strong interest in something, it will usually make you give off a good vibe when you're doing that thing. Passion and enthusiasm are attractive things.
If you dress in a stylish way, it will be attractive. Some girls show off their legs, boobs, ass, neck, hair, eyes, etc. It's all up to you - what style appeals to you? Look around you and try find some role models that you respect. You can then try and copy their style.
So: You can dress attractively and you can be attractive (by pursuing or doing things you enjoy and just having a good time with life!)