'cos you're only in your skin and nothing else
because u are wearing only your skin<br />
the most natural outfit there is ! your birthday suit :)
Because you look skinnier without clothes?<br />
Or maybe because you're only wearing your skinny.
something to do with it only swimming with your skin.
because you dip in the water in just your skin. Or, if you're a little overweight, you can call it chunky dunk