Clothing exports to the US have risen by 151 per cent over the past two years as companies take advantage of duty-free access under the Africa Growth and Opportunity Act (AGOA) an industry association bosses said yesterday.   Clothing exports last year were worth almost R2 billion according to Jack Kipling, the chairman of the Export Council for the Clothing Industry. He added that exports to the US were growing at a faster rate than to Europe, where import duties were being phased out gradually.