You're gonna find that it varies a lot between different guys. Some will say none, some boyshorts, some thongs, some this, some that. Probably easiest to find out by talking to your beau about it.
Personally my preference is silky or soft, especially in black. But I also like the ones with the ruffle on the back, rhumba I think. Or a shimapan, the blue/white striped panties. I'm alright with just white cotton, or the thong style ones that are high above the leg.
It's ultimately up to the guy and you. But for intimates try black/red. White/pink on certain occasions.