Vtg 100% wool Mackintosh montello black below knee dress coat women's size M/L

Vintage Union made 100% wool black long dress coat. Classic elegant dress coat. Collared neckline puff pleated shoulders darting detail front and back hidden button placket 100% wool long length Lined side pockets pit to pit 21 in length 45 in There is no size tag so I estimate this to be a medium/large. I normally wear a size medium and this is a bit too big for me. I included arm length photo as the length runs a bit shorter than modern coats