THE INFLUENCE of New York Fashion Week is being felt in Philadelphia, which has launched its own version called the Philadelphia Collection. Beginning Monday, there will be shows and events for 12 days that rival the hoopla of the Big Apple. As a salute to the Collection, here are a few of the people whom I consider Philly's style tastemakers. They are the kind of people you see on the street and say "Wow, where can I get a look like that?" If you approach them, they just might let you in on their style secrets.