SAN FRANCISCO--(BUSINESS WIRE)--Gap Inc. (NYSE:GPS) today reported that net sales for the five-week period ended April 4, 2015 increased 1 percent to $1.53 billion compared with net sales of $1.51 billion for the five-week period ended April 5, 2014. “We are especially pleased with the strong customer response to Old Navy during this peak spring shopping month, and we remain focused on the steps necessary to drive improved product consistency across our entire portfolio,” said Sabrina Simmons,