Answer:
I start in little but I end in full, you'll find me in half and complete.
A seasonal fashion statement named for the weather it's worn in.
What has a head yet it never weeps, has a bed but never sleeps, can run but can not walks, and has a bank but not a cent to its name?
Mouth up it gets filled, mouth down it gets empty.
It has the biggest wall and is also used when drinking tea.
What do you purposefully put lots of in and on your body, but run away from when you encounter it outside?