I came across a guy online who said he lost his loose skin naturally. He said it was still more fat he had to lose, which kind of makes sense, since skin is paperthin. The loose skin does normally have fat behind it too. And skin does regenerate every year. He said once he'd reached a good size in clothes, he kept losing fat and a year after, his loose skin was gone. So I guess if you lose weight sensibly and keep going till you're a normal BMI, the skin should retract. Failing that, total body lift lol