No tag with size but would say Small.  Underarm to underarm measures 22inches/56cm. 

Length 40 inches/102cm

Hook and eye fastening.

Unusual tie collar. 2 Pockets.

Please note a small burn to one sleeve at cuff, but you'd never notice it. I bought the coat like this and only just found it.

I have never worn the coat myself, but in great condition.