I even found and downloaded some instructions for use:
1. Insert right arm into right sleeve until hand protrudes from end of sleeve.
2. Repeat #1 with left arm.
3. Pull coat up to completely cover shoulders.
4. If desired, pull two front halves of coat together and fasten button for extra warmth.
5. To remove coat, do #4 through #1 in opposite order.
That's some pretty high-fallutin' military stuff ya got there.