That's a good question. Style and fashion are different, yet they co-mingle, overlap and usually work together. Style is personal, it's about you. Fashion is about an industry and what others (fashion designers) tell you looks good and is "in" at the moment.
Your personal style will evolve and develop with you as you mature, along with lots of trial and error. Your style is a reflection of who you are, it's a way to express yourself to the world (whether you like it or not). Fashion also changes, quickly I might add, so they can keep us coming back for more. I tend to fall for that one.
Knowing yourself and your own style allows you to say no to certain fashion trends because you know they're not for you, or that they won't work for your body or age. It also helps you focus your shopping so you can end up with a closet full of pieces that work together and are interchangeable. Now, that's not to say you can't be eclectic and mix it up, go for it! It just takes a little practice to put it all together.
Do you know what your style is, but need some help with execution? Maybe you know what you'd like your style to be, but just need to be pointed in the right direction? Or, are you thinking that finding a style and dressing stylish sounds lovely in a dream world, but you're just happy to have something clean to put on in the morning? =) Been there, done that. I can help. email@example.com