Advice from a long time R9 carrier...I have a bunch of fancy leather holsters, IWB, OWB, including Del Fatti beauties, but my daily carry holster is a DeSantis Superfly G2. It is light, sticky (the pistol comes out but the holster stays in the pocket), not too tight and not too loose. Costs almost nothing and comes with a velcro pad that can be placed on either side and makes it a great ambidextrous back or front pocket holster. I use the pad front pocket to obscure the print when wearing chinos and other loose slacks as well but take the pad off for jeans or tighter pockets.
You can't go wrong with a clean, tested, proven R9 loaded with ammo that it prefers. Like many women I have known, these little pistols can be picky about what you offer them, so be sure your ammo is the one that particular pistol likes.