Friends? Or more?

How can you tell if something is a date or you are just friends?? Theres this guy and I see him ONLY as a friend...nothing else!! Sometimes hes bordering just being friends...LOL!! So anyways we were hanging out and I was like all bummish looking and he was all decked out like we were going to meet the president!!! What we were doing was VERY casual!! Do I give him some kind of signal that there is something more?? Cause whatever that signal is...it needs to be cut off!! I think hes cool as a friend, but nothing else!! I don't want to hurt his feelings, I'm just not into him like that!! Help!!!