Breast fat grafting

I have some questions about breast fat grafting~~

From which area is fat removed for transplantation?

2. People who have had breast surgery, as they age, lose skin elasticity, but their breasts remain firm? I've seen such photos. Would fat grafting result in the same outcome?

The amount will vary depending on the dosage, but I'm also curious about the cost.

I'm also curious whether the areas where fat was removed will become uneven or bumpy.

These are the questions I usually had about chest surgery. Haha

Please let me know if anyone knows~~