Most fashion student sketchbooks are A4 size. However, there
is no fixed rule on this as some students successfully work with
A3-size sketchbooks. Sometimes working across a landscape
A3 format can be useful for sketching A4-size fashion figures
and developing preliminary line-ups. The smaller A5 pocket-size
sketchbooks can be useful for discreetly carrying around; they
also work well as fabric swatch books and for entering additional
thumbnail sketches. (See page 166 for the North American
equivalents to A3 and A4.)