Ladder back chairs are not normally slipcovered, though, as I've discovered, practically anything can be slipcovered. Or at least people think it can and then hire me to do it! Anyway, my client wanted just to have covers made for the backs of the chairs. There are existing seat cushions, which really don't match the new backs (you'll see this in the bottom pictures,) but they can always be re-covered in the future. Also, she may just take the seat cushions off and use the back covers alone.
The front view of the arm chair. I used snaps under the arms to connect the front and back. The other option would be ties, but ties are messy and there would need to be too many. Snaps work better for this type of look.
In this case, the button-back is strictly decorative. It is not necessary to actually button and/or unbutton to remove the cover. After undoing the snaps, it just lifts off.
There are 6 chairs in total, 2 arm chairs and 4 of this style. This is me being too lazy to take the seat cushion off for the picture.
You can see how they don't really match, although they do have similar colors.
These also just slip on and off and much easier since there are no arms.