Soldiers in the Fiji Defence Force still wear sulus -- I've seen them at the Edinburgh Military Tattoo.

http://www.fijifvb.gov.fj/about/visitor/attire.shtml

I believe there were also Samoans and/or other Pacific islanders who wore sulus who served with the USMC against the Japanese. Have to do some checking on that one.

Cheers,

T.