Green’s Dictionary of Slang

towns and cities n.

a woman’s breasts.

1960		J. Franklyn Dict. of Rhy. Sl.
1978		Maledicta II:1+2 (Summer/Winter) 118: Elsewhere Aylwin lists a few more ‘Vulgarities’: [...] words for breasts (brace and bits, [...] towns and cities, fainting fits).