Upmarket clothing retailer Tommy Hilfiger USA has received a federal grand jury subpoena concerning documents related to domestic and international buying office commissions paid since 1990.

A company press release issued on Friday said some of Tommy Hilfiger USA's current and former employees have also received subpoenas.

The investigation concentrates on whether the commission rate is appropriate.

Tommy Hilfiger USA, a wholly owned subsidiary of Hong-Kong based Tommy Hilfiger Corporation, said it pays buying office commissions to a non-US unit to provide or otherwise secure certain services, including product development, sourcing, production scheduling and quality control functions.

The company said it is responding to the investigation, but is unable to predict its timing or outcome.

Repercussions of the investigation could include a potential restatement of income.