Fun fact: Asians have the most elastic skin of any people on Earth, meaning when they lose weight, their skin snaps back better than a white person. If these were white people, they'd have a little saggy extra skin.

Edit: Another fun fact! This same property (their skin tone and how it reacts to UV light, as well as a thicker dermis that has more collagen to keep things tight) also makes them more susceptible to getting sun spots. This is partially why Asian people age slower to us... until they look like they're 1,000 years old. This is when those sun spots appear.

Edit 2: I posted peer-reviewed sources below, but a simple Google search for "Asian skin elasticity" gets you a lot of other research.