You're looking for the unitard fit; but I think you'll see, the perfect fit is hard to achieve. With most unitards off the rack, getting something like the nounibutt look, where the garment fits closely into the buttcrack showing off each butt cheek, can be difficult. I have advice on how to do this.
There are many places to get a unitard, and some can be very expensive. But often the look you want may need customization that you can't get from any websites.
I understand what you say when you say you want a look that will turn a guy on, but that's kind of beyond the scope of this message board. I like to see this message board devoted to male danseurs who discuss their concerns about dancewear, and think many guys here feel the same way. That's not to say some of us wouldn't discuss a look that turns guys on one-on-one. My email address is theboy@balletboy.com. I'm sure others may contact you too.
balletboy[/i]