Austin-based Digby, a developer of mobile shopping software and storefronts, reported today that Arden B., the women's contemporary division of Wet Seal, is using the firm's Mobile Commerce Platform for its mobile web storefront. The deal is an extension of an existing win that Digby has with Wet Seal, which implemented Digby in December. Digby operates a software-as-a-service offering which allows retailers to offer up their catalog to mobile phones.