The term Utility Clothing became associated with Britain's Utility Scheme during WW2.
However, apparently such a "utility" in fashion seems to have been known even before this time.
I came across an article entitled Utility Futility, which expands upon the word Utility and its associated negative fashion meanings which were present before the commissioning of the 1941 scheme.
Here is a relevant excerpt from that article (bold is mine):
Why was “Utility” such an inadequate label? First, it had been used in the clothing industry before to describe a type of heavy-duty garment designed to weather tough use, the equivalent of what consumers today might think of as blue-collar “work clothes.” It appeared with relative frequency in advertisements for coats and jackets well before the Utility scheme’s conception, proving that consumers already had a preexisting idea in mind when they heard the word “Utility,” an idea contrary to the reality of Utility scheme clothes35 […] “Utility” made consumers picture drab, unflattering jumpsuits.
The first verdict came in February 1942, when the Drapers’ Record, a prominent journal for clothiers and other sectors of the clothing industry, released one of the earliest articles surveying women’s initial receptions of the Utility scheme. The article began by pointing out that since Utility had yet to make a significant appearance in stores, many of the women interviewed based their opinions solely on their impressions of the word “Utility,” rather than on firsthand experience. One interviewee commented that “Utility” made her think of a uniform – “government stuff, sackcloth.” Another interviewee worried Utility clothing would be “clumsy and heavy.” Still another expected colors to be “dark and uninteresting.” The reporter even added that these three women had not heard about the scheme before being interviewed about it, further demonstrating the power of the word “Utility” to produce negative first impressions of the entire project.
Are there online first-hand resources regarding such clothings deemed to be like these 'utility clothings' later (e.g., pictures or illustrations of such "utility clothings" from that time)?
The article does refer to a Vogue advertisement of that time of interest:
35 Advertisement for Allama “Utility” coats. Vogue, February 1939, p. 29.