The pattern for this summer top is from Nina Wall's Book of Light Weight Knitting, which appears to focus on lighter, cotton knitwear.
This little jumper has a nice stripe pattern - but check out the V-neck, yowza! Risque indeed. I've honestly never come across something so low-cut from the forties.
To fit a 34 inch bust, and knitted on 3.25mm and 2.75mm needles using fingering weight yarn.