Are probably going to have to separate the seatback from the cushion for ease of access.
Cut the hog rings holding the cover to the frame in that area...enough to be able pull the cover back so you can access the backside retainer and detach retainer from button.
Then, you'll have to separate the button halves, find a small piece of the fabric, and recover the button top. I believe these are not usually glued, but simply pressed together (in my past experience).
Then reattach button to retainer, reattach cover with new hog rings, reassemble seatback to cushion, and off you go.
My guess is that the fabric pulled off the button as people slid their backside down the seat while getting in.
Just one of the reasons I don't particularly care for adornments in the seating areas.
Cut the hog rings holding the cover to the frame in that area...enough to be able pull the cover back so you can access the backside retainer and detach retainer from button.
Then, you'll have to separate the button halves, find a small piece of the fabric, and recover the button top. I believe these are not usually glued, but simply pressed together (in my past experience).
Then reattach button to retainer, reattach cover with new hog rings, reassemble seatback to cushion, and off you go.
My guess is that the fabric pulled off the button as people slid their backside down the seat while getting in.
Just one of the reasons I don't particularly care for adornments in the seating areas.