Stanford University swimmers, clad in bikini skin suits, won three events and set an American record tonight to take the first-day lead in the Association for Intercollegiate Athletics for Women national swimming championships at the University of Pittsburgh.

Stanford leads the meet with 178 points over defending champion Arizona State, which totaled 165. Florida is third with 163.

The black suits seemed to provide a psychological advantage to Stanford as hoots and hollers greeted the women as they took off their sweat suits prior to the first event, the 200-yard freestyle.

The foursome of Linda Jezek (26.06), Noel Moran (29.26) Libby Beaudet (25.98) and Kim Peyton (23.56) blazed to a 1:44.86 to break the American standard it set in the prelims. North Carolina was second in 1:45.52, followed by UCLA in 1:45.58.

Texas' Jean Pennington won two events within 10 minutes. She took the 100-yard butterfly in an ALAW-record 54.44, edging defending champ and American recordholder Diane Johanningman (54.74) of Houston and North Carolina State's Beth Harrell, an Alexandria, Va., swimmer who clocked 54.83.

Pennington, a freshman, after picking up her award, returned to the blocks for the 200-yard individual medley and was ahead of American-record pace until the turn into the freestyle. She faded in the last 15 yards to miss Tracy Caulkins' mark of 1:59.33, recording 2:00.81.