Uniform and career apparel company Superior Uniform Group Inc on Thursday posted a 26 per cent jump in third quarter earnings from the year-ago period despite a slight fall in quarterly sales from last year. The Florida-based company said net income for the quarter ended September 30 rose to $1.99 million, or 27 cents per common share, from $1.6m, or 22 cents per share, in the 2002 third quarter.