I love it when my wife wears clothes that show her off and of course she has been happy to do this for me. When we were out I would always try to position her so as to afford some other guys a look. I was not always lucky in achieving this dare but sometimes she would do things like part her legs slightly and position herself so that I was sure she was trying to give other guys a look up her skirt.
One night at a bar after a few too many drinks I decided to ask her if she was aware of the fact that I was trying to show her off to other guys. I figured that most women (and she certainly is) are smarter than men when it comes to awareness and alertness to situations. To my surprise she told me she wasn't and seemed quite shocked that I would try to do something like that and that I had not looked after her as I always told her I would when we were out. Then she smiled and said, "Of course dummy!" and proceeded to flash me right there and then.
Needless to say I was turned on and wanted more. This all started for us as newlyweds and continues to this day and she knew and she liked it too.
At this time, she now hardly ever wears panties whilst at home and still wears short skirts when we're out, she knows that I like her showing off to other guys and she has made it even more obvious.