From pattern presentation on magazine:
“Cornelia Tuttle Hamilton delivers irresistible bib overalls and Guernsey-style pullover for baby. The top is knit in two pieces with cabled drop shoulders, back buttoning neck. Overalls sport matching cable motifs, front-button placket and cabled straps. Updated baby wools colors from Froehlich-Wolle.”

From introduction to pattern instructions:
“Intermediate (level). Baby’s two-piece outfit. Guernsey-style pullover knit in two pieces, with cabled, drop shoulders, back-buttoned opening and round neck. High-waisted, bibbed overalls with matching cables, front placket and cabled straps.”

The pullover requires 2 (3, 3) 50 gr balls of one colour.
The overalls require 3 (3, 4) 50 gr balls of one colour.