"I'd never seen a shape like hers" - what was she, hexagonal?

Can't off-hand think of a Real Old True 1954 Proper Good Honest Kids These Days Call That Folk? Get Off My Land Real Old Genuine Traditional song which talks about a woman's 'shape' in that nudge-nudge way - usually when they want to say 'breasts' they say 'breasts'. That Ralph McTell song (of which until today I was happily unaware) is even worse - she's got 'curves', knoworramean. Curves beneath her dress, even. It's positively Daily Mail -

She was busting out all over, boys,
You could see she was all grown up
Her dress left little to the imagination
As she flaunted her womanly curves...

Excuse me while I wash my mouth out.