At the risk of admitting my addiction to Stargate tv series,
there are any number of companies that have what are known as
"tactical" vests. For example,

www.lapolicegear.com/5tave.html
www.copsplus.com/prodnum3214.php

or just search for "tactical vest"

Just make sure that it doesn't clash with your B5 or Trek uniform...

(*snorfle*)