The multiplicative principle is the tool allowing the counting of groups that can be described by a sequence of events. An event is a subset of sample space, i.e. a collection of possible outcomes, which may be equal to or smaller than the sample space as a whole. It is important that students understand this basic principle early on and know how to apply it, because it is the basis for more complex subjects such as Combinatorics, Probability, and Statistics gathering. In this article, the authors aim to facilitate children's understanding of the multiplicative principle through a cooperative, entertaining, and enjoyable activity: "making fashion!" They share the resources they have been developing to facilitate the understanding of multiplication. They propose the use of paper dolls for teaching the multiplicative principle. Using the paper dolls as a didactic resource helps the understanding of mathematical concepts through the manipulation of concrete objects. Using this toy, children's imagination, creativity, and logic can be stimulated by the various possibilities it offers. (Contains 2 figures.)