ivory float, n. — Green’s Dictionary of Slang

ivory float n.

[rhy. sl.]

(US) a coat.

1928		M.C. Sharpe Chicago May: Her Story in Hamilton (1952) 132: Ivory float – coat.
1935		A.J. Pollock Und. Speaks.
1949		Monteleone Criminal Sl. (rev. edn) 87: float A coat.
1953		Berrey & Van den Bark Amer. Thes. Sl. (2nd edn).