I got 3 yds, 54" wide
I only wanted one seam (on the bottom)
There was enough to take the back section out if you ran the long dimension (of the back) parallel to the (sides) wrap around piece. Plus a chunk left over for "the future"
You want plenty of width for the sides. As careful as I was to get the tolex parallel with the sides it still wandered off by the time I went all the way around.
It's way easier to cut off the excess than to glue more on because you shorted yourself
I'd cut it even wider if I were to do it again.