If you're looking for workplace fashion tips, Robbins is an expert on professional style.
This sentence contains an error of logic I read (and revise) a lot: I call it a "false conditional."
The conditional clause is the the dependent clause that starts with the word if—a conditional sentence follows this formula: "If A is true, then B is true."
In the example sentence, the independent clause's truth doesn't really depend on the conditional clause's truth—Robbins is an expert whether you're looking for fashion tips or not. So the sentence is illogical. And it bugs me.
Here's a better (and shorter, even) sentence:
If you're looking for workplace fashion tips, Robbins has expert advice for you.