I use elastic straps with double snaps on both ends (in case one comes off) a snap plate is glued inside the shoulder and snaps attached st elastic shoulder strap, if you have this a little further forward on the strap it will help bring the shoulders inward after you move your hands. I like to use snaps as over time the elastic ban stretch and its easy to swap out.
There are many ways to attach them, some glue the elastic, some use Velcro, it’s really what ever works best for you.
Good luck with what you decide