Vancouver is a city on the north bank of the Columbia River in the U.S. state of Washington and the county seat of Clark County.
The width of the twin quilt is 66 +12 (for the two extra columns of 9 patches) + 4 (for the two extra strips of sashing) =82, which is a bit wider than your target of 78, but close enough. Plus, it's nice to have it a bit too large than a bit too small.
Different countries have different standards for the size of mattresses, and blankets designed to go on beds tend to be significantly bigger than the bed, so there's room for tucking and for a little bit of blanket to hang over the sides of the bed. In America, the standard sizes for blankets are as follows: 1  Crib: 45 by 60 inches. 2  Twin: 66 by 90 inches. 3  Double: 80 by 90 inches. 4  Queen: 90 by 90 to 100 inches. 5  King: 108 by 90 to 100 inches.