The V&A is just about to republish a delightful little book called How To Dress For Success by the Hollywood costume designer Edith Head. First published in 1967, Head meant it to be a manual for ordinary American women, both housewives and 'career girls'. It is a riveting period piece but what I noticed was the chapter in which she adviseds women on how to dress according to their size. The smallest sizes she cites are US 6, 8 and 10. There is no 4, 2 or 0. This tallies with my recollection of Britain in the 60s when only teeny, birdlike girls could fit into an 8 and most of were 12 or 14, or 10 if you were small. No-one I knew had an eating disorder (lack of central heating in most homes made eating salad in winter inadvisable). No-one was on a diet. . No-one ate fast food or ready meals. No-one was overweight. We now seem to be striving for mythical sizes. It's all in our heads.