Abstract: Since the 2D CAD of collars is not intuitive enough,it is difficult for customers to participate in the design process of collar styles.This paper proposed a novel method that supports customers to design collar styles intuitively and conveniently.A multi-level model is established for parametric representation of 3D collars.Geometric models of typical collars such as stand collars,flat collars,shirt collars,tailor collars are given and then the collar surfaces are automatically constructed.Collar surfaces are also modeled by dragging the contour curves.Constraints expressions and solving methods are introduced to make the editing process friendly.By encoding/decoding the contour curves,collar style models can be saved and reused,and thus,design results can be shared among customers.A mass-spring model-based method is adopted to flatten 3D collar surfaces to 2D patterns,and then customers can decorate the collar appearance by texture mapping.Finally,some design examples of collar styles are given which show that our methods are suit for convenient interaction with customers,and easy to express their individual ideas and requirements.