In a move to profit from the trend towards more casual clothes in the office, men's wear retailer Men's Wearhouse Inc has offered commission incentives to salespeople to sell more casual clothing.

The move will mean higher costs in the short term, with long term benefits expected in approximately a year's time, said chief financial officer Neill Davis.

Currently, the clothing ratio is 60 per cent formal business wear and 40 per cent casual. That will change to 50-50 during the next three years. The company is keen to keep formal business wear as a major part of its offering, as it expects to see a "balance" between formal and casual office attire.

To support the shift, Men's Wearhouse says it will continue its advertising campaign, with one of the main incentives being the need to protect market share from department stores, said Davis.