Nudie Dudie: A Jiggy McCue Story by Michael Lawrence - old paperback

Age :7-9

Jiggy is given a pen - one of those with a scantily-clad female in it who loses her clothes when the pen is tipped. Trouble is, when Jiggy uses the pen, his clothes disappear too - but being Jiggy, he doesn't put two and two together until he has suffered a number of very nude, public and embarassing episodes.