Several things.
Not every male notices the finer facets of sex appeal and fashion. A good friend of mine (a GG) once told me, "If you want to get a guy's attention,
make it big and make it red". I believe that CDers who dress this way, do so because this is what they find sexually appealing in women. They
want to be sexually appealing, but not necessarily to men.
At first I was also confused, wondering why a straight CDer would dress in the same manner as a GG who wants to attract men. A hetero CDer is not attracted to the man so much as he is attracted to himself appearing as his definition of a sexy female. It is the thought that he is alluring when dressed that excites him, not an attraction to a particular man. I'm sure you've read threads in this forum where some of the hetero CDers take it one step further and place an image of a faceless man in their fantasies, as an accessory to the fantasy. Yet when the hetero CDers have actually gone out and tried having sex with men, they report feelings of disappointment (generally speaking), which is a confirmation it is about the appeal of the self as a sexy female rather than an attraction to men.
There are also CDers who wear risqué outfits without looking like sl*ts. I know this is highly subjective, but I've seen tasteful boudoir shots, where the CDers use the clothes to feel as feminine as they can. We can't assume that all such outfits produce the same amount of sexual release.
Babs ... I've never seen so many stars in your post.
EDIT
I repeated myself quite a bit in this post, sorry. I was writing it in segments.