To define a fop, a dandy, or a poseur, we have to treat them separately; though in the dictionary they are considered synonyms. There are subtle, but vital differences between those words. And of course, because we're dealing with human beings, with their endless expressivity, and creativity, there is considerable overlap. But I'm going to treat here with essentials in each case, allowing for movement this way and that, along the continuum that is Attire.
If it feels like I'm getting a mite heavy handed, so be it. There are predators out there, and deeply fearful people. Some of them have learned this language we all speak to an extraordinary degree. We, any of us, would be fools indeed to think that we are not still prey to those who present a faultless image to us. Making ourselves more observant, and more facile with this huge and complex tongue, is only going to be a good thing at the end.