The nylon/elastic purse holsters that most manufacturers include with the bags are a place to start, but they will not be a good fit for many guns.
Your gun won't "snap in" - these holsters have zero retention. If you tip the holster upside down, the gun will slip out. We strongly recommend getting a kydex purse holster that's molded for your specific gun model, with snap-in retention.
You'll get several loose adhesive velcro sheets with it, so you can attach it however you prefer inside your bag (or any surface).
This bag is gorgeous, I have had so many compliments. My gun fits in so nicely, I love the two zipper entries.
Ron (North Carolina)
Wife loved it
This was a gift for my wife. Technically it was for Christmas, but her primary purse was falling apart, so I gave it to her early. She has been very pleased with the new purse. It carries easy, and has a touch more volume than she needs on a daily basis... but it is not too large. And her Beretta 92FC fits nicely.