I am pretty sure I've seen them prance around on Kobol in digital pattern BDUs with an urban colour scheme instead of ACU/CADPAT/MARPAT colours. It was darker than the usuall urban patterns but if your friend is not a BSG purist, some ACU knock-off in an "Urban" pattern should do.
Kinda like this one:
Sold here:
http://www.vtarmynavy.com/urban-digital-bdu.htm
I've also seen the Pegasus security detail use UMP's as opposed to the Beretta CX4's that the Galactica's guards carry.