Casual clothing retailer Pacific Sunwear of California Inc on Tuesday posted a big jump in first quarter net profit on the back of a 17.4 per cent year-on-year rise in sales to $161.7 million. The Anaheim-based company said net income was $3.3m, or 10 cents a share, compared to $1m, or three cents per share, in 2001 which included a one-off charge of $3.5m, or 11 cents per share.