I tend to agree with gem's assessment (and the other posters) in that "class" which I think in this sense means a certain "je ne sais quoi" or sophistication, goes hand in hand with the idea of personal grooming. I may get scathed for saying so, but not everyone is "well-suited" to wear the fetishistic leather gear we associate with BDSM. I recently surfed onto a website of a foreign nation's "klub" and the alumni photos depicted a group of balding middle-aged men who've obviously let their bodies go to pot (as it were) but were decked out in the full "gear" with studs, black leather straps, etc. and to my aesthetic eye, they simply looked silly if not unintentionally satirical. In sharply-tailored suits, they might have appeared as "captains of industry" -- as it was they looked pathetic, and certainly didn't invoke feelings of "wow, classy!"

I am a creature of sensual aesthetics and I admit freely that when in latex, or leather, satin or lace, a nice body can look very pleasing, indeed. That's not shallowness, simply an eye for the appropriate and while "inside" the person may not be someone I want to know, outside the image is appealing. But real class and sophistication go beyond the surface appearances -- it's attitude, experience, a certain sophistication about all things, and yet still being able to "slum" effectively among all classes and levels of society.

Take a bigot, a petty mind, crassness and put them in an Armani suit, you still don't have a formula for "a class act." Even if they may know which is the salad fork or the soup spoon.