This pattern was produced by McCall for Church World Service (CWS). McCall has a long tradition of cooperative ventures; see their pattern supporting the Red Cross during WWI, Red Cross Pattern 35, Taped Hospital Shirt. It would be interesting to know if McCall produced the CWS pattern gratis or simply at cost. It would also be interesting to know if McCall did the pattern drafting or if CWS hired this out on their own. I'm guessing that the somewhat amateurish illustration was produced by someone at CWS.
A section on the instruction sheet explains the goals:
PATTERNS FOR DIGNITY
Personal dignity and self-respect -- these are the things you provide for refugees, disaster victims and other needy persons overseas through the United Clothing Appeal of the Churches.
New clothing, in the styles requested by our friends abroad, will represent in a most meaningful way the Christian concern and compassion of the American churches for those who desire above everything else to stand on their own feet.The pattern reflects a time when women (always the primary consumers of home sewing patterns) had the time and the skills needed to sew for others.
This set of work clothes has been simplified in ways that meet the specific needs of both the seamstress and the recipient. Note that the sleeves are just hemmed, because setting in cuffs takes time and can be fiddly to do well. A hemmed sleeve that is too short might be unattractive, but it won't flap and get in the way an unbuttoned cuffed sleeve does and can be easily rolled up. The shirt front is closed with gripper snaps, quicker than having to make button holes and sew on buttons, and as long as the snaps don't pull out, maintenance free for the wearer - no buttons to lose and have to replace. The elastic waist bands in the slacks and shorts will assure a broad range of fit. Although the pattern doesn't call this out, made up in cotton broadcloth, these clothes could be used for pajamas.
Church World Service is still in operation. A few simply drawn patterns for infants clothing are available, but for the most part the expectation is that donors will supply purchased clothing.