Having sneakily looked around for info on the equipment available, it seems they already have the graphics in place for many different colours and textures of undergarments for all races (yes, including some silky-sheen ones!). It's only a matter of time before Square-Enix makes these recipes available to us to craft.
Looks are relatively unimportant to me, however, since they will be covered up almost all the time. I'm more interested in having undergarments with interesting statistical benefits, though im not sure how wearing silk panties will make you more dexterous.
FFXI: Siren Server: Seiowan Lvl 99 WHM, SCH, BLM
FFXIV: Ragnarok Server: Lemuria Glitterhands All Classes 50