It's important to have facts first. Slaanesh is about sensation and violating mores. Slaanesh says yes when others say no, and his trap is followers are driven to ever-greater extremes because their sensations become dull to old experiences. The appearance of Slaanesh and his daemons is often that of irresistible physical perfection.
I am confused. have you made this up because you think this is what it is suppose to be or just read some fanfic that gives you this idea.
Slaanesh is the God of hedonism and excess. This DOES NOT MEAN EVERYTHING IS NEKKID!
Whoa, slow down a bit. Instead of suggesting that I have made things up or using some faulty reference, just simply ask for sources. It's a much nicer tactic and uses fewer words.
Both the previous edition of the Chaos Space Marines codex (because the current one is a flavorless wasteland) and the current Chaos Daemons codex make reference to Slaanesh remaking or gifting his followers as he wishes. So, whatever whim the god of hedonism, excess and pleasure can imagine, so can it be. (Both codices also support what I wrote in the post to cause this question.)
I would think the realm of Slaanesh might encompass a bit of bits, as it were. Now, if you can show me how this *could not* be the case, I'd be very interested to read that.
It may be that some have a hard time imagining how a naked woman could be alluring. I'm not here to judge.
Also, she's not naked. She's totally wearing a belt.