UltiClip3+

I've tried a few different clips for my holster and this one holds my pistol securely without any shifting. The slim design hides well under a t-shirt, exactly what I needed.

Swapped this onto my everyday carry and the difference in how tight it holds is honestly kind of absurd. The clip bites down hard enough that I stopped adjusting it every time I stood up. Just remember the hardware isn't included, so order the screws at the same time.

The flat profile really does disappear under a tucked shirt, way better than the plastic clip I had before. Retention is solid too, no wiggle at all when I draw. Only thing is you need to buy the screws separately, so plan ahead.