(USATODAY) — The company that makes American Airlines’ new uniforms is speaking out for the first time regarding complaints by flight attendants that the outfits are making them sick.

The issue with the flight attendants’ uniforms came after American rolled out new uniforms to more than 70,000 of its frontline workers in September. The look of the uniforms has been well-received by many of American’s workers. But, in December, the carrier’s flight attendant union called for a total recall of the uniforms, claiming the outfits have sickened as many as 2,000 attendants with symptoms that include rashes, itching, headaches and eye irritation.

Clothing manufacturer Twin Hill pushed back against those complaints in a Monday letter to the Association of Professional Flight Attendants (APFA), the union that represents American’s cabin crew.

Note: Read our discussion guidelines before commenting.