Excellent Conditioned Nylon Beagle Collar Blouse.
Probably made by St Michael (label has been cut).
White blouse with large navy polka dot.
Bodice is lined in polyester, sleeves are sheer.
Pearlescent buttons, single button cuffs. 
Under collar popper closure.
For the fuller figure shape. 
Labelled as 38" Bust (hand written)
Measurements Laid Flat:
Pit to Pit: 21.5"
Bust: 21"
Waist: 21"
Hips: 22.5"
Length from collar: 22"