Girls notice whether you make an effort to look your best. You should dress up enough when you are going to meet a girl. It should look like you're going somewhere special, not going out with your buddies.
Generally, yes. You should try to cover up as much as you can, depending on your comfort level. That being said, if you're okay with showing off your body, go...
No, unless she's wearing high heels and the dress goes to the floor. Otherwise she wouldn't be able to walk without tripping. Some dresses do have a train, though, that's...
Some twelve year olds may suffer from Down syndrome or autism. This can make the child unable to dress themselves properly. Someone may also dress a twelve year old if...
You may find ways that she likes you in so many different ways, pay attention to her body language, and the way she talks to you, and try group perspectives...