There have been many studies and recommendations made regarding the flammability standards of uniform materials.
Here are two links for more information:
Transport Canada Advisory Circular
http://www.tc.gc.ca/aviation/COMMERC...RY/ac0136e.htm
Flight Safety Foundation (you'll need Adobe Acrobat to view)
http://www.flightsafety.org/ccs/ccs_mar_apr99.pdf
This is a clip from the FSF document:
"Uniform Materials Affect Flight Attendant Safety and Ability to Help Passengers Evacuate Burning Aircraft.
No specific flammability standards exist in the United States for flight attendant uniforms. Clothing-safety specialists said that the best alternatives currently available are pure woolen outer garments treated for fire resistance and undergarments made of natural fibers."
[This message has been edited by CD (edited 29 February 2000).]