Why? For the very reason that you want your purses to look like the designer's: The designer has the cache, has the popular design, and "what it takes" to sell and make the line profitable. You'd be trading off it unfairly. Consult with a trademark attorney to get the guidance on avoiding what could be a nasty situation, if the designer ever got wind of it.
Nina L. Kaufman, Esq. is an award-winning New York City attorney, edutainer and author. Under her Ask The Business Lawyer brand, she reaches thousands of entrepreneurs and small business owners with her legal services, professional speaking, information products, and LexAppeal weekly ezine. She also writes the Making It Legal blog.