I wish I knew. I used to have the t-shirt too. Bought it in 1992. color used to lean a little more to the purple, but not much. I've been told it could be " south african special ops urban camo" or commercial. The company info on the tag is as follows:
Adder
Box 1 Pofadder 8890
Republic of South Africa
I'm thinking I need to talk to Mokwepa, he can tell me if that is a properly formed address. I'd kill the president of paraguay with a fork for a set of BDUs in that patterned on the Vietnam slant pocket Ripstops.... Or a bolt of fabric to do the interior of my Power Wagon with.