Would the same not then be true for the Union flag as well then - i.e. If the hoist side of the flag is on the left (as it is usually printed) then the thick white band on both diagonals on the left are above the red diagonals, but if the hoist side is on the right (as you would see it from a flag pole) then it would look as though it were "upside down" - If you made the error of assuming the hoist side were on the left, if you get my drift.
those 'protesters' in Belfast last night. Both women had their union flags upside-down.
...to them it looked the right way up - you were looking at the reverse side.