Answer:
By Moon or by Sun, I shall be found. Yet I am undone, if there's no light around
Crooked as a rainbow, and slick as a plate, Ten thousand horses can't pull it straight.
It is an arctic double breasted formal wear.
What has two legs but doesn't walk?
Long and slinky like a trout, never sings till it's guts come out.
Almost everyone needs it, asks for it, gives it. But almost nobody takes it.