Answer:
I am a kind of coat that can only be put on when wet.
I've been argued on my color. Without me you'll die. So many attempts on your life use me so make sure you have many of my White friends.
Born of sorrow, grow with age, you need a lot of me to be a sage. What am I?
We are little airy creatures all of different voice and features one of us in glass is set. One of us you'll find in jet. Another you may see in tin. And the fourth a box within. If the fifth you should pursue it can never fly from you.
I am one small little piece of paper yet sometimes hold lots of value. I am all you need to get in to big events but will cost you. I am an important part of travel. And if lost you're not coming.
I start with T end with T and within me is T.