Fabulous vintage 70’s 80’s denim trench-coat Jacket M Spatz

I’ve held on to this jacket because it doesn’t have a size tag and it is missing the top button. It’s too great to keep in my must list soon pile another year! I’ve included pictures showing the measurements. My guess is a medium- my daughters wear a M and it’s roomy. Lots of neat funky detail. This jacket is not belted but it is a little more fitted at the waist. Unique item! Someone needs to rock this look. Missing top button.