This is one of series of knit and crochet patterns for Barbie (and other fashion dolls). All of the patterns are based on simple mathematics. This one uses the Fibonacci Sequence for two knit dressesone and crochet dress. It also includes a mini-tutorial for using this special sequence.
This pattern is based on numbers, some of the others will be about making clothes using geometry.
All of the patterns will be using very basic yarns so can probably be made from leftovers.