"Wallet-style" holsters come in two types, neither of which is intended to remain in the pocket when the gun is drawn.
One type is a folding wallet, like a large billfold, that encloses the gun. The case is removed from the pocket, opened, and the gun taken out with the other hand.
The other is one that the gun is inserted into, with the slide exposed above it, and cutouts for the trigger finger. The holster and gun are drawn out from the pocket as a single unit, and the gun is fired while still within the holster.
If you're looking for a holster to carry the gun in, placed in a pocket, and to remain in the pocket when the gun is drawn, you're looking for a pocket-holster. My favorite for the P32 has been the DeSantis SuperFly, which as a removable discretion flap to break up the gun's outline; the flap can be moved to either side of the holster, or left off completely.