Green’s Dictionary of Slang

bell-bottomed trousers.

1969		Current Sl. IV:3-4 (1970).
1970		New Yorker 21 Mar. 39: Having purchased a pair of red velvet bells for thirty dollars and finding them not to his liking.
1974		(con. 1940s) E. Thompson Tattoo (1977) 359: He walked a little between the bunks getting the feel of the twenty-one-inch bells.
1983		R. Price Breaks 90: I could tell; they were ex-greasers from the tightness of their bells.
1997		(con. 1970s) G. Pelecanos King Suckerman (1998) 4: He wore lemon bells.
2002		D.H. Sterry Chicken (2003) 5: I come with long feet and big hands, nut-hugging elephant bells, a too-tight T [...] and red high-tops.
2012		G. Pelecanos (con. 1972) What It Was 14: Jones reholstered the .22 in the dip of his bells.