Big and tall apparel retailer Casual Male Retail Group Inc has appointed boxing legend George Foreman to its board of directors.

Seven months ago, Foreman signed an agreement with the retailer to develop and market a specialty line of clothing and act as a spokesperson for Causal Male.

Chairman Seymour Holtzman said the company was now "flattered and extremely pleased" to welcome Foreman to the board.

"I am confident that he will make important contributions to the future strength of our company," Holtzman said.

"By joining our board, Mr Foreman, who is also the Casual Male spokesperson, will take his involvement to another level by being actively and directly involved in the development of new products and the growth of our company overall."

Foreman will replace Stephen Duff on the board of directors.