There are of course other ways to earn the money for your life of pure excess. Those are just some ideas to get your started.
Now, lets talk hedonism in regards to your clothing. There are two things to keep in mind when it comes to your new Slaaneshi wardrobe: Does it look good? And does it feel good?
And those are your only two criteria. Ignore gender roles, ignore fashion styles of the season, ignore price or brands.
I'm just going to through out some suggestions here, because youre taste are different then mine, and what looks good and feels good to me, might not to you. And vice versa.
But to give you some idea, lets talk underwear. More then likely you wear some. I've met few guys the go commando and less women. If you are, however, a commando type, fine, just apply these guidlines to the rest of your clothing.
Step one, try multiple different types of your given garment. In the case of underwear, try out boxers, briefs, panties, thongs, boyshorts, bikini briefs, and any other kind you find. Find what looks good to you and what feels good to you.
Step two, material. Try your garment of as many different materials as possible. For undergarments this can be cotton, polyester, silk, leather, latex, vinyl, plus any I've missed.
Once you have a favorite, move outwards. Things get more complex after this in the different styles of clothing out there, but find what you like. Don't be afraid of trying something that society says is obscene or perverse, but if you aren't comfortable in something, don't wear it.
Remember this though, for many rituals of Slaanesh, one must expose or keep exposed the right side of their chest. You may need to modify your clothing to match this. Cutting swathes out shirts or dresses and removing the right cup from your bras.