Skinny Winnie and her sister Minnie

From where did the term "skinny Winnie" which is used to desribe very skinny people come from?

Thanks

I think you mean "Skinny Minnie." At least, Google turned up 16 hits for Winnie and 2,160 for Minnie. I don't have any sources for you but I'll bet it's a combination of appealing rhyme and double-entendre (mini/Minnie).