Just finished attaching my chest armour to the vest. i used steel eyelets, as can be seen on the ILM props. i bought the eyelets from a 'Hobbycraft' store, they are very easy to attach, everything is included in the pack except a hammer.
You can trace around your own armour onto cardboard for a template, but make sure that you keep the same curvature or the holes in your jacket won't line up with the bolts on your armour when finished.
Just a note: If you wish to troop in your armour you will need to cut off any excess bolt when finished (a dremel will do the job), get the bolt as short as possible so it won't dig into you.