Such a book would work as a catalogue of a designer’s previous Mastercards. Mastercards are specification sheets that are sent to mills in order to produce commercial amounts of fabrics for tailoring into final products, such as suits. Keeping a catalogue of previous designs is useful for designers to take inspiration from and for re-releases of iconic designs. Interestingly the sample book was created during the Great Depression, there is a surprising amount of colour with many daring designs.