Drew,
Until you get your perfect custom holster, may I suggest that a lot of the ones made for more common .380s will work. I use different holsters depending on the pocket profile of my pants.
One of my favorites, as well as lightest and thinnest is a size 03 CQC made for Blackhawk in Italy of really really soft sued leather. I got it at Academy. It was made to be an inside-the-waistband for a Glock 26/27. I cut the stitching off of the belt clip and trimmed it down a little on top.
Desantis also makes a couple of very inexpensive pocket holsters as well. Although not leather, they work and are easy to find.
I wouldn't want to put my Rohrbaugh in kydex either.
I think a handgun should either be in the hand, or in a holster. And it freaks some people out when you walk around with it in your hand.
Good luck in your holster search, and let us all know what you find that you like.
Griff