rule of thumb has some good things going.. i am stealing idea for rough measurements..

the classic one, it was bigger (or smaller!) than a bread box.. ( i was an adult before i ever saw a bread box!)

so what phrases do you have for bigger, smaller, shorter taller, thinner, fatter, faster slower.. that are about a rough measurement.

(you know, , Short? you're asking if he was short? he could walk under a table and not muss up his hair sort of thing too..)