OSKA generous size 1 dark navy, or in some lights dark grey, tunic dress. The viscose? fabric has a very fine pale check. Mandarin/grandad collar, front buttoning placket to waist, long sleeves, dropped shoulder, hanging loop, 1breast pocket, Oska tab. Fabric label removed but feels like viscose. 
P2P 28”
Waist 28”
Length 34”
Very good condition.
I’ve received a query about the size of this item. It is possible that it is a Comfort Size 1, but there is no label to say so, just a size 1 label.  It is oversize for a size 1 regular, sort of batwing style.