Aren't those already available in some (online) stores?

Yeah there are people messing with this. There are models for product photography and such too. You don't really need to use nudes.

You first need to train a LoRA on the subject, such as yourself. You need a bunch of angles in various lighting conditions. Hundreds of images are best but like 20-50 will do. You need to be wearing similar clothes and as much of a variety of outfits as possible. The hard part is that you need very detailed captions that are unique to each image. You are training on the things that are the same, so if you are the only consistency in the data set, it will train to know you. If you wear the same black shirt in every image, the black shirt is a feature of you, and the model does not differentiate. There is no real logic in generation. Most of the logic is in training captions.

Now do the exact same thing with each piece of clothing; all lighting conditions, worn with many other clothes, etc.

Now you can stack the LoRA layers and see yourself anywhere while wearing said garment. That is how it works.

Now I can set up a complex toolchain to do image to image, but saving the face to make it the same is a pain in the ass, and takes a lot of tuning for each instance. I still need a trained fine tuning LoRA to get a specific near replica of a product. I can easily make a dong like an ankle leash or boobs drag the ground. Those are like universal products. Hell, I can even gen a woman lying in grass with SD3.

The real question is easily accessible datasets and the motivation to caption. There are auto-caption tools, but they suck for the level of detail desired here.

there was a big thing with software that would put you in a suite for video meetings while in pjs or I guess nude but you sure has hell better have faith it works 100% of the time then.