Object in pocket

Darren gave me this classic prompt; There is a coat with a pocket. In that pocket is an object. What is it and what is it about to be used for?

There wasn't anything very special about the coat. I found it at a typical second hand store hanging beside other winter rejects. It was the color that actually caught my eye. It was crimson; the color of a dark pomegranate flower. The rich fabric lured me over and before I knew it the coat was purchased and hanging in my closet. I looked at it there for a day or two, sticking out like an injured thumb against my otherwise drab wardrobe of all black or tan items. Finally, I decided to return it, never realistically seeing myself wearing it. I should at least try it on once though, just for fun, I thought. I pulled it off the hanger and slipped my arms in. It fit nicely and I pulled it closed admiring myself in the mirror. I rarely saw myself in such a vibrant color. It looked good. I put my hands into it's deep pockets and twirled a bit. That was when I felt it. I didn't know what it was at first. I just felt a lump and realized something was sewn into the lining of one pocket. I explored it with my hand trying to determine what it could have been but I couldn't for the life of me figure it out. I took the coat off and laid it out on my bed, then I got out my fabric ripper from my sewing kit. The seems ripped easily and within moments I was able to reach it an retrieve the object. I pulled out a cylinder shape that had been wrapped over and over with tissue paper. I carefully unwrapped the layers, a little nervous about what I would find. I felt like I was uncovering someone else's secret and I wasn't supposed to find it. Finally I got to the last layer and holding my breath I carefully opened it revealing a long thin bone. Even though I was disgusted by it, I was also entranced and I picked it up, turning it around. I noticed something scratched into one side and I lifted the bone closer toward the light to see better. What I saw sent chills down my spine. Three letters precisely carved into the thin bone. B.I.H.
I dropped it on the bed and ran to the phone. I dialed the police station. "Hello, this is Brenda Harris. Brenda Inez Harris and I think I found a human bone."