Please direct me to an Internet (or other) source where I can purchase
the Lacoste dress worn by Catherine Hurley in the print ad for Lacoste
Pour Femme fragrance. The dress was about knee length with what
appeared to be a tie/halter neck, and appeared to be made of cream
silk. It had a Lacoste alligator as well. Thank you.

I think an example of the dress is at the lacoste.com site.  Click on
the link that features their fragrances.  If you can print the
picture, you can take it to a Lacoste boutique.