This is the installment of this great motion picture series in which Margaret is so infected with the spirit of St. Patrick’s Day that she swears allegiance to old Erin, goes to watch the Parade on Fifth Avenue, cheers the green flag enthusiastically and has as good a time as if she really came from the “ould sod.” Margaret also finds time to visit “Louise,” the fashionable milliner, and is delighted with the new spring styles, which make “Our Mutual Girl” even more attractive than ever before. She tries on ever so many beautiful hats of the most chic Parisian design, and every detail is shown on the screen as clearly and minutely as in a mirror. They are perfectly captivating! Then she calls on Elsie de Wolfe, the most famous of all interior decorators.