Vintage "Londonus" ladies tweed 38"
 
3 buttons 
2 slanted front pockets
1 breast pocket
Single back vent
 
Some moth - see pics and age related wear 
A beautiful tweed, cut and tailoring that it's hard (if not impossible) to match with modern off the peg coat.
 
All measurements taken on the outside with the garment laid flat:
 
Chest 20"
Nape below collar to hem 27.5"
Outside sleeve 22"