Here is the link to the Key West Fashions website:
http://www.keywestfashions.com/kwfashions/
I think the story is that Key West Fashions made the original Lilly fabric. I have seen this line where I live and I just returned from FL where I saw it as well in several beach boutiques. I think anyone would be pleased with it as an alternative to Lilly Pulitzer.
Another idea- Check out eBay for Lilly Pulitzer items. There are tons of listings and you should be able to get a good deal. Just be sure to order your correct size because you probably would not be able to return something .