Bohemian style was not really until the First World War that "many working women ... embarked on a revolution in fashion that greatly reduced the weight and restrictions imposed on them by their clothing". Some women working in factories wore trousers and the brassiere (invented in 1889 by the feminist Herminie Cadolle and patented in America by Mary Phelps Jacob in 1914) began gradually to supersede the corset. In shipyards "trouser suits" (the term, "pantsuit" was adopted in America in the 1920s) were virtually essential to enable women to shin up and down ladders. Music hall artists also helped to push the
Item response theory Item response theory In psychometrics, item response theory (IRT) (also known as latent trait theory, strong true score theory, or modern mental test theory) is a paradigm for the design, analysis, and scoring of tests, questionnaires, and similar instruments measuring abilities, attitudes, or other variables. It is a theory of testing based on the relationship between individuals' performances on a test item and the test takers' levels of performance on an overall measure of the ability that item was designed to measure. Several different statistical models are used to represent both item and test taker characteristics. Unlike simpler alternatives for