Speaking from a guy's point of view there is nothing a wife can do but TRUST her husband. It will come down to him making a decision to a) flirt back b) cheat c) Tell her he's not interested or d) Go to HR and file a sexual harassment claim (not likely to happen).
The truth is the only person any of us has control over is ourselves. Most times when someone attempts step out of their lane to contol another person tensions increase, blood pressure rises, frustration, and jealousy eat at your soul. I imagine some women probably would blame their husband for not being able to "control" the woman's behavior. Other women would flirt with a male co-worker or respond to a guy who flirts with them and make sure their husband knows about it in hopes he'd put an end to his female co-worker's activities.
Again neither he nor the wife can tell a grown woman how to dress and odds are if he complained the woman could flip things around and say he's was making inappropriate comments to her. This is one of those Serenity Prayer things.
"God, grant me the serenity to (accept the things I cannot change),
Courage to (change the things I can,)
And wisdom to (know the difference)."
There is one other choice the husband has.... quit his job. However with unemployment being close to 10% that's probably not a good idea.