“To be smart this season one must be more than slim. The figure must defy nature and be as flat as the proverbial flounder, as straight as a lead pencil, and boneless and spineless as a string-bean. One must be straight like a boy and narrow like a lady in a Japanese print.” – Delineator magazine, February 1924.

Two corselets from 1925. Left, Butterick corselette pattern 5691; right, ad for Bien Jolie corsette # 6099. Delineator magazine.
Corselets, Corselettes, Corsolettes, & Corsettes, 1924 to 1929
Delineator writer Evelyn Dodge explained the difference between a corset and a corselet in her “The New in New York” column dated July 1925:
“Not all women need corsets. Women with young, slender figures find that the corselet, which is a combination brassière and hip-confiner, is sufficient. It is unboned and is therefore as soft and flexible as the natural figure. It keeps the figure straight without making it rigid. It is made of soft light fabrics such as brassière material, broché coutil and fine washable satin and has elastic gores to fit in at the hip. “
“Corsets” were heavily boned and rigid. (“For the figure that is heavier… the corset becomes heavier with heavier material, more bones… and with lacings.” — Dodge) “Corselets” (or corselettes, corsolettes, corsettes, etc. — you could find many spelling variations even in the Delineator‘s articles and advertisements) were unboned, or very lightly boned, and flexible.
The woman in this 1924 Bien Jolie Corsette is doing something you couldn’t possibly do in a heavily boned corset: she is bending at the waist. (If you do bend too far in a metal-boned corset, the bones develop a permanent crimp, a dent or a bulge.) The ad says, “The freedom of the uncorseted figure and the long, slim lines demanded by the modes of today are both attained by the Bien Jolie Corsette. . . .”
A Delineator article called this boneless garment a “brassiere corset” early in 1924:
Butterick Corselette Pattern No. 5691, 1924-1925

Butterick corselette pattern # 5961, Delineator, Dec. 1924. The corselet is shown worn over bloomers.
In her July 1925 article, Evelyn Dodge went on to say:
“You can either buy or make your corselet. It is very easily made, and if the figure is large or small at one point or another the corselet can easily be fitted when it is being made.”
You can see that there are no boning channels in the corselette, but coutil is a non-stretch corset fabric vith very little ‘give.’ Elastic in yardage wide enough for mass-produced girdles was not available before 1930, according to Ewing (Fashion in Underwear, pp. 102-107), so some corselets of the 1920s show wide bands of overlapped elastic. You can see this in the illustration on the right, below.
The pattern description doesn’t say whether this corselette opens with hooks and eyes under the left arm . . .
. . . or along the side front seam, like this commercially made corselet.
Dodge continues, “These corselets have been enormously successful for several reasons — their excellent lines, their inexpensiveness, and the fact that they can be washed as easily and as often as any other piece of lingerie. They are supple enough for sports and dancing and their unbroken lines are perfect under the light fabrics of evening gowns.”
Commercially Manufactured Corselets, 1924 to 1929
Although the spellings differed, the popularity of the corselet is apparent by the number that were advertised.
The Treo company, a line available through Sears, Roebuck’s catalog, as well as in stores, called this model a “Brassiere Girdle” combination garment:
The DeBevoise company suggested that this Step-in Corsette belonged in a bride’s trousseau:
This Warner’s corselette for large figures is “boned in the modern manner,” although the “silk jersey top” can’t have had much impact on a large bust.
This Bien Jolie satin brocade corselette dates from 1924:
By 1926, flattened busts were going out of fashion and a more natural silhouette was beginning to replace the “unbroken straight line” of Butterick #5691.

Bien Jolie Corsette Ad, July 1926. Delineator. Note the elastic curving in toward the waist and the model’s curved silhouette.
By March, 1929, Delineator showed these “foundation” garments [note the name change; they are no longer ‘corselettes’] in an article about the latest underwear styles:
By 1931, you could buy this Smart Model “co-ed” foundation with “new bustline, no boning” from a Sears catalog for $1.98.
This is part 4 of a series about undergarments in the 1920s: to read “Brassieres, Bandeaux and Bust Flatteners” (click here), “Underpinning Twenties Fashion: Girdles and Corsets” (click here), “Garters, Flappers & Rolled Stockings” (click here.)