Virtual reality tools for product development including collections of avatars and virtual reality business models for avatar use. A method of designing a product to be worn by an individual includes selecting a population of avatars, where each avatar provides a representation of at least a portion a human body, and the population of avatars may be representative of a population of individuals. The method also includes obtaining a set of data describing a product to be worn by the individuals in the population of individuals, for each avatar, in the population avatars, generating a virtual reality simulation that simulates an avatar interacting with the product, and analyzing the interaction between the avatar and the selected product to evaluate at least one performance characteristic of the product.