Georgia-based apparel manufacturer Oxford Industries Inc on Monday blamed "weak consumer demand" for a 64 per cent plunge in third-quarter earnings and falling sales. The firm saw its net profit plummet to $1.4 million, or 18 cents per share, from $3.9m, or 53 cents per share, in the year-ago period, as quarterly sales slipped 24.3 per cent to $149.5m.