[header] How to get guys to look at your face instead of your chest [title] Make a subtle noise. [step] When you catch a guy staring at your chest, make a sound to indicate that you know what he's doing and you don't appreciate it. Clear your throat loud enough for him to hear you and don't continue the conversation until he looks up at your eyes. 
When he does, give him a quick scowl to let him know his actions aren't cool. [substeps] You can also say something like " ahem.