1900s: Light in the loafers - "light-footed - pertaining to a homosexual male. Cf. 'light' (sense 1). Light on his feet. (U.S. slang, 1900s) light - 1. lewd; wanton (numerous writings attest since the 1300s)." From Slang and Euphemism: A Dictionary of Oaths, Curses, Insults, Ethnic Slurs, Sexual Slang and Metaphor, Drug Talk, College Lingo and Related Matters by Richard A. Spears (New American Library, Penguin Putnam, New York, Third Edition, 2001).

1955: Lightfooted. Homosexual. Fairly common since c1955." From Random House Historical Dictionary of American Slang, Volume 2, H-O, by J.E. Lighter, Random House, New York, 1997."

1967: light in the loafers - or light on one's feet - (of men) effeminate or homosexual. 1967 From Dictionary of American Speech, Supp.

1993: light on his toes, homosexual. Of a male, from the mincing manner of walking adopted by some: "Your assistant in the theatre, sir, your dresser, he's a bit light on his toes as well isn't he? (Monkhouse, 1993 -- a policeman was enquiring about sexual activity which appeared to involve homosexuality, bestiality, pornography, and prostitution) From A Dictionary of Euphemisms by R.W. Holder (Oxford University Press Inc., New York, 1995)