The popular screen team of Claudette Colbert and Fred MacMurray stars in this wartime farce. MacMurray is an army pilot who develops engine trouble during a vital mission. Thinking he's about to die, MacMurray radios back his undying affection for his dog "Piggy." But the radio reception is fuzzy, and it is assumed that he has said "Peggy"--which happens to be the character name of Colbert, who intercepts the message. MacMurray survives the plane crash, whereupon he is whisked back home into the arms of Peggy, which is not to the liking of Peggy's gormless fiance (Gil Lamb). Practically Yours was guaranteed to make money, which it did. Its humor not meant to survive the ages, which it hasn't.
by Hal Erickson synopsis