NEW YORK#—Legislative in vestigators of wiretapping have been told about a cosmetics firm’s tapping of the telephone of its own employer, and about a wom an who carried a recorder hidden in her brassiere. These were among anecdotes from the “bugging” field heard yesterday by a joint legislative committee, headed by Assembly man Anthony P. Savarese Jr., Queens Republican. Bernard B. Spindel, an electron ics expert, testified he warned a married woman client against en trapment by another woman. The client, Spindel related, met the other woman in a restaurant and spilled her purse to make sure I did not contain a recorder; later a rival investigator reported the other woman had had a recorder i her brassiere. A representative of Revlon Products Corp., a cosmetics man ufacturing firm, testified the com pany had monitored and once even had tapped telephones of its em ployes in efforts to improve ‘ef ficiency, courtesy and service.” Reviow’s controller, William D. Heller, said the employe tele phones were monitored at his re quest during a training program beginning five or six years ago. Another witness was Raymond Spector, president of an advertis ing agency and a majority stock holder in Hazel Bishop Inc., a cosmetics firm. Spector and Revlon attorney Nahum A. Bernstein both de nounced wiretap spying they said was done by business competitors. Spector testified that last No vember the Hazel Bishop firm had run into “strange coincidences” about matters that had been dis cussed only by telephone. Spector said investigators later told him they found taps on his telephone and on the telephone of Norman Jay, then Hazel Bishop president.