By Ali Lyon The owner of the Jacamo and Simply Be clothing brands has blamed macroeconomic challenges for the slump in revenue it reported in its full-year numbers. N Brown Group, which also owns the fashion and lifestyle platform JD Williams, saw its revenue drop by 9.8 per cent to £601m in the 52 weeks to 2 March, while its adjusted earnings before interest, tax, depreciation and amortisation (EBITDA) dropped by 12.5 per cent to £47.6m. However, despite the revenue fall, the firm also shored up its bottom line to post a major hike in profit before tax, up from £4.9m in 2023 to £13.3m on an a…