Specialty retailer of women's fashions, Christopher & Banks Corp, on Thursday revealed a 35 per cent jump in first quarter sales to $77.8 million from $57.6m in the year-ago period and said same-store sales were up 10 per cent. The Minneapolis-based operator of 391 stores under the Christopher & Banks and C.J. Banks labels also revealed that May same-store climbed 12 per cent and total sales surged 35 per cent to $24.8m for the month.