before you buy a holster for both of you to use, I would recommend that you and your wife try them n, and see how they work. Because women's hips are shaped so much differently than a mans (YIPPEE FOR THAT) where the holster fits on the hips and how it effects the draw stroke vary greatly. A holster that works really well for one of you, probably will have a mediocre fit at best for the other one. This is especially true for a CCW holster.
A woman's belt loops often position the holster so the butt of the gun is rather dramatically pointed into her waist, requiring her to bend her body strongly to the side in order to keep the pistol from hitting her just under the ribs. A holster that fits her well, will probably "print" quite prominently for you.
I used to be a firearms instructor for an agency that had a number of women who needed to carry concealed. There are a few really nice holsters made for women, but not nearly as many as for men. Coming up with a holster design for women that is comfortable, secure, easy to draw from, and conceals well is somewhat like turning lead into gold. There were 4 qualifications I noted (comfortable, secure, easy to draw from, conceals well)...pick any three and there are lots of holsters. If I could design a holster that hit all four, I could make plenty of money off it.