Answer:
What gets bigger the more you take away?
I am pronounced as one letter written with three. I come in blue black brown or grey. Reverse me and I read the same either way.
I am a kind of coat that can only be put on when wet.
I am a piece of paper that takes most people 3 or 4 years to get. What am I?
I have a ring but no fingers. I used to stay still all the time but nowadays I follow you around.
The warmer I am the fresher I am.