Only in response to the question, "why did you think he was [sth]?" If the sentence is not an answer to a question then you will need to make it more complete. For example "Because of the outfit and such, he looked like a pilot", or "He looked like a pilot because of the outfit and such".

That is not a complete sentence. It is a fragment. This sentence is not constructed properly. I'm not sure what you are trying to say. I am thinking you are trying to say: "His flight suit and badge made him look like a pilot."