Total June sales at Pacific Sunwear of California Inc were $73.3 million, an increase of 26.6 per cent over last year's June sales of $57.9 million. The gain was largely due to a 12 per cent improvement in the men's business. The casual apparel and footwear retailer said same-store sales increased 10.5 per cent for the comparable five-week period, with PacSun same-store sales up 10.5 per cent and d.e.m.o. same-store sales up 10.3 per cent.