Japanese lingerie manufacturer Wacoal posted a slight drop in first-quarter net income on the back of strategic investments.

The company said net income fell 1.3% to JPY2.7bn over the quarter ended 30 June, as sales increased 1.1% to JPY43.4bn.

In the company's domestic business, it recorded a strong performance in its core brasseries and bottom products through its "body ageing" campaign, which focused on the physiological changes associated with ageing. However it said this was partially offset by sales of its seasonal undergarments due to the unsteady weather conditions.

Internationally, the group said it made "aggressive efforts in expanding our US market share and enhancing our product line-up mainly at department stores".

Meanwhile, international operating profit improved on the back of cost reduction efforts.