Be sure to complement the young ladies who are good examples, including your daughters. : )
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Oh, and, "you're dressed so modestly today!" doesn't count! : P
When a lady wears a modest dress that looks good on her, it's appropriate to tell her that her dress is nice.
It shouldn't sound like an attempt to get attention nor should it be so loud that everyone nearby can hear it.
An honest complement does a lot of good.
Often times you can see her confidence come out a bit more because she feels more attractive.
Some women spend a lot of money on their appearance.
But when poise and taste are combined it doesn't have to be expensive.
And when that's been achieved, it ought to be appreciated with proper intentions.
.
Therefore,
All a man has to do is say
nothing to a woman whose appearance might be glamorous yet immodest.
In regards to the thread title, high heels do not constitute successful modesty, but that doesn't mean a lady can't have a modest appearance with moderately high heels, it's just not so easy to pull it off. I think it takes some practice, physical coordination and muscle tone for a woman to wear moderately high heels without looking immodest. If she's out of shape or tired or walking on a too-soft surface, she might have difficulty keeping her balance and that will compromise her gracefulness which could make her appear
attractive to someone with improper intentions. She might be able to use this to discover what a man really has in mind, or to find out if he is capable of behaving honorably.