My husband will say something in a respectful manner if he thinks there is something questionable about my dress/ appearance. And I appreciate it because I wouldn’t want to go out questionably dressed, and because he expresses it respectfully I want to take it from him. In general if you want to be taken seriously by your wife be pleasant / respectful. That’s always been the Jewish way.
But it is a shame when men don’t say anything at all, in today’s day and age, because some women are unaware or they could use the knowledge that their husband is displeased with this way of dress. In a healthy marriage a woman wants to look good for her husband so that would be a strong incentive to dress modestly. Again, if expressed in a respectful manner.
Also if a man doesn’t watch his eyes his wife won’t respect/ will resent his wishes for her to watch/ curtail her inclination for looking beautiful (which can be expressed in inappropriate dress if it isn’t watched.) Maybe that’s why some men are ‘wimps’ about not telling their wives about this?