This is a gorgeous navy blue wool vintage Dereta double breasted princess coat.
It is lined and the lining is faded. There isn’t a fabrication label but I believe it is made from wool and has that feel to it. It’s a fab coat to wear all year round.
chest size: 104cm
shoulder to shoulder: 44cm
The coat has been photographed on a UK10 mannequin and I estimate it would fit a UK16-18.