Fast fashion is in its prime . The May 8 grand opening of Primark — the Irish-born multinational retailer known for selling trendy clothing, home goods and beauty products at bargain bin prices — at 150 W. 34 St. brought Manhattan’s penny-pinched shoppers out in the masses. Approximately 3,000 of them, in fact. As the affordability crisis continues to hit New Yorkers, they lined up from 3 a.m. to be among the first to experience the flagship, eager to get their favorite styles for a steal.