Social Psychologist have consistently shown that women underestimate how often men are attracted to them and inversely men overestimate how often women are attracted to them. The bottom line is even if you don't think he's interested in you, there's a good shot that he really is attracted to you.
From a man's perspective, there's nothing more attractive than a woman who stands tall, keeps her shoulders back, and saunters by like she owns the world. It doesn't matter if your carrying a few extra pounds or not as young as you use to be. Walking with confidence will bring eyes your way.
Have you ever had one of those moments when you accidentally catch someones eye and keep it for a bit to long, then smile and look away? That's what I'm talking about here. There's something special when you make a connection like that. If you can recreate it, you'll be in his head all day long.
Jocks, nerds, hipsters, business men, exc...there are all types of guys. And even within types of guys, it isn't consistent what types of women that we find attractive. Women who some of my friends find attractive, don't do it for me. If you want to turn a certain guys head, you'll have to dress in a way that will catch his eye. But most importantly, just dress for yourself, some guys will find you beautiful some won't. Just think of it as a way of sifting out unwanted suitors. Men are attracted to different things.
Finally, along with be confident and smile. Enjoy life. Someone who is enjoying life will always get a man's attention.