That's kind of hard to figure out. Usually, a "replica" means a lower-cost, lower-quality version of something, like a replica sports jersey or a new version of something that is o longer made, like a replica car.
Here's the tricky part: A replica can be an *authorized* licensed replica or not. I would normally think of a replica jacket being an authoirzed but lower-performance version of something racers wear, using the sports jersey analogy. Otherwise, a jacket that says "Suzuki" on it is just a jacket, no matter whether you buy it from a Suzi dealer or off ebay or what.
So I'd say that if you find one you like and the price is right, who cares?