Answer:
A seasonal fashion statement named for the weather it's worn in.
What does someone else have to take before you can get?
What's that 7 letter word with thousands of letters in it?
What never gets any wetter no matter how hard it rains?
I start in little but I end in full, you'll find me in half and complete.
Almost everyone needs it, asks for it, gives it. But almost nobody takes it.