Photoshop generative fill

I suppose what I need couldnt be uch more simple.

I have a shirt wich in this example is green, it has shadows and folds etc as its a real image, i select the shirt using the magentic lasso only and give a command as simple as change the colour to #7182aa, and I end up with images of shirts with all sorts going on, or a denim shirt over the t-shirt, basically everything but just simple changing the colour.

Any adice. My aim is that I wont to seel t-shirts and Im having one t-shirt photographed in a studio, but then I want to change the colour to a specific colour so I have a range.

Check out my result, shen all I have typed is - change the colour to #7182aa