How do I get my wife to loosen up?

My wife is one of the most beautiful women in the world, in my eyes. She is 47, a mother of 2, that are grown, and we have been married for almost 3 years. My only problem, (and admittedly, it's not that much of a problem), is that she is so very conservative. That, in itself, isn't a bad thing. She raised those two girls very well, worked her butt off to get them to adulthood. But, it's only me and her now, and I'd like her to loosen up a little. She's got a fabulous body, and a beautiful face to go along with it. I'd just like to see her walk a little sexier, sway her hips a bit. She still walks and acts the way she thinks is "appropriate" for a mom raising young girls. I like to show her off, let her be seen. I like for other men to look at her while she's walking with me, just so I can smile to myself and say "Yeah, you can look, but she's mine". I'm extremely proud of her, and I've always believed in the saying "If you've got it, flaunt it". In other words, if you look good, let people see that you look good, nothing wrong with that. Any suggestions? I don't want to share her, and I don't necessarily want her to dress and look so sexy when I'm not with her, so don't go getting any ideas. Just looking for reasonable suggestions. thanks in advance.