California-based designer, manufacturer and marketer of women's clothing, St. John Knits International Inc, on Tuesday posted a 13.1 per cent fall in first quarter sales to $87.9 million, compared to the year-ago period. The company reported a 34.5 per cent slide in operating income to $15.6m, while net income for the period was $5.8m, or $0.70 per share, versus net income of $9.6m, or $1.30 per share, in the year-ago quarter.