LOS ANGELES—A Fashion District clothing company owner was sentenced Dec. 6 to a year in federal prison for scheming to undervalue imported garments and avoid paying millions of dollars in duties and taxes to the United States. Ambiance Apparel owner Sang Bum “Ed” Noh agreed to forfeit $81.5 million as part of his plea deal, according to the U.S. Attorney’s Office. The 67-year-old Bel Air man pleaded guilty last year to one federal count each of conspiracy and filing a false tax return. Documents filed in Los Angeles federal court outline separate schemes involving Ambiance and Noh, ending in September 2014 when law enforcement authorities executed dozens of search warrants as part of an investigation into money laundering and other crimes at Fashion District businesses. In the customs fraud scheme, Ambiance imported clothing from Asian countries and submitted fraudulent invoices to U.S. Customs and Border Protection (CBP) that undervalued the shipments and allowed Ambiance to avoid paying the full amount …