Somewhat rough twill, feels somewhat slippery. Pants made of heavier fabric than shirt. Could be from Libya, Romania (source: http://www.newrhodesian.ca/viewtopic.php?p=7891#p7891), or former Yugoslavia (see usage photo below). As used by SWAPO in Namibia. Captured by same 32 Battalion officer as Cuban shirt.
Same/similar pattern used by Chetnik in 1990s Yugoslav Wars: