The officer didn't wait for my car regristration before writing my speeding ticket. He also had on a knit cap.

It is an urban legend that the officer must be in "full uniform, including hat/cover.etc. to write a citation.

With regard to your registration, it goes to the weight of the evidence, but does not mean you will be found not guilty. if the officer can establish, beyond a reasonable doubt, that you were operating a particular vehicle, you will be found guilty.

Depending on the speed you were traveling and the points that will be applied to your license, you may consider going to court to ask for a reduced speed or a different charge that carries no points.

An attorney can be helpful to you.