Maggie Moores, n. — Green’s Dictionary of Slang

Maggie Moores n.

also maggies

[rhy. sl. = drawers]

(Aus.) women’s underpants.

1941		Baker Popular Dict. Aus. Sl. 45: MAGGIE MOORES: Women’s drawers. Rhyming slang. Also ‘maggies’.
1955		N. Pulliam I Travelled a Lonely Land (1957) 120: Hope you’ve got on your Maggie Moores. You’ll need ’em today.