Answer:
Slayer of regrets, old and new, sought by many, found by few.
It is an arctic double breasted formal wear.
It's like food but water kills it. What is it?
Runs over fields and woods all day. Under the bed at night sits not alone, With long tongue hanging out, Resting at your feet until we go for a walk
Known to accessorize with feathers, trumpets, and harps.
If itβs information you seek, come and see me. If itβs pairs of letters you need, I have consecutively three. What am I?