Green’s Dictionary of Slang

rammies n.

[Malay rami, a Chinese and East Indian plant of the nettle family (Boehmeria nivea); thus the fine fibre of this plant, extensively employed in weaving; note rammy rousers n.]

1. [1910s–60s] (Aus./S.Afr.) trousers.

2. [1950s] knickers.