White dots on a pale blue background dress by Ronald Pass.
80s does 40s or 60s style.
I have been unable to find anything about the Ronald Pass brand.
Semi-fitted bodice with a collared neckline and short, loose fit sleeves.
3 working buttons down the centre front so breast feeding friendly. 
Fitted waistline with belt loops (no belt included) into an a-line skirt.
No material compostion label but feels like cotton.
No size label. I recommend for 20.
Bust- 46". Waist- 43". Hips- Free. Length from underarm- 33.5".
Preloved but in very good condition.  Two small 'curious' features of the design do need pointing out. The bottom hem is only tack-stitched up (I do not think this is original) and there is a pocket in the side seam but it is on the waist line which feels unusual!