I'd start by using the search button... but I think most people use velcro (sewn to the vest, and sticky-back on the armor) or they use snaps (one half glued to the back of the armor)
I've tried just about every method out there over the years since I started my suit. Velcro, bolts through eyes in the vest, etc. I really like the snap method the best. Snap method as GNCgamer illustrated would be my advice
D