If you look in the wiki section, there should be 2 or 3 tutorials for attaching armor to the flak vest. Velcro and the 'chicago screw' method seem to be most popular nowadays. As well, look for a thread called "Dressing a Bounty Hunter in 40 Steps". It's a pic by pic tutorial on how ILM dressed and test-fitted the original screen-used and pre-pro suits, contributed by RafalFett.