This is a pair of white Reno Silver Sox pants. The name Alvarez and number 14 is written on the inside pocket with a marker. This would be John Alvarez who played for the Silver Sox during the 1978 and 1979 seasons. The number 4 is written on the other pocket. There is a Russell size medium tag in the waist. John Alvarez was a top player on the team these years.
The pants have a drawstring, no fly. The knees are reinforced and there are stains here and there. See photos.