Answer:
I hatch without food
Marking mortal privation when firmly in place. An enduring summation inscribed in my face.
Brown I am and much admired; many horses have I tried; tire a horse and worry a man; tell me this riddle if you can.
From house to house I go, sometimes narrow, sometimes wide. Whether there's rain or snow, I always stay outside. What am I?
I am a kind of coat that can only be put on when wet.
The warmer I am the fresher I am.