I dress up and get pretty because I like to dress up and get pretty. If guys notice me and say that I look nice I always like it but I don't dress up for them. I like dressing up and I'm in school so the only real occasion to dress up is the bar and it's nice to throw on some heels and a cute top once a week and go out. I could care less what everyone else is wearing I just like dressing up and going out.
I dress up nice mostly for my sake, I love fasion and all that stuff (btw I do not wear makeup often and if I do it is only mascera and lip stain for special ocasions) ,...then after myself I would not mind to get attension from the guys, but not in a creepy sexual way, but more of a she looks pretty way. I don't want to be precieved as slutty or full of myself either, so I dress acordingly. I have never thought of dressing up as a competition with other girls to see who is more pretty, cause I always know there is prettier girls than me, and I don't have to be the best, I am fine with appreciateing other people's beauty.
Preferably, I would rather dress to impress the guy I like, but even though lots of girls fuss about how they look, if people really like each other, you don't really need to dress up as long as you are together.