During his early period as a fashion photographer, Richard Avedon (1923-2004) did some work for Simplicity, including the Fall-Winter 1950 issue of Simplicity Pattern Book:
The suit is Simplicity 3310, made in Botany flannels and worn with “[m]atching hat designed for Simplicity by Sally Victor,” Simplicity 3322.
Inside, the hat is shown photographed by Halley Erskine:
The back cover is a Botany ad, apparently from the same Avedon photo shoot:
I have a Canadian copy of Simplicity 3322 in the shop, printed with a special Chatelaine magazine logo:
For more on Sally Victor see my Mad Men-era millinery post.