The "boob window." This model is trained on 16 images of keyhole cutouts in clothes. This model is trained on 16 images of clothing featuring a keyhole cutout.
Usagedskyhl is the bare minimum needed to see this model in action. Then, describe the type of clothing you would like. Keyholes might be a little hesitant to show up on some prompts, but this can usually be addressed by increasing the weight of the model.
I've tried this model with shirts, sweaters, and dresses, and I've tagged things such as sleeve length as I usually do, to try and make it as flexible as possible.
Known Issues
I recommend using Hi-Res Fix or ADetailer to fix faces.