bearisgray

I would cut lengthwise strips for three reasons:

1) Lengthwise usually has less stretch
2) The piece may or may not be cut exactly straight/even
3) This will have to pieced anyway, and I think it is easier to cut shorter lengths

How I arrived at those numbers:

Use the perimeter measurements plus four additional border widths plus seam allowances.

Was given the 90 inch measurements and decided to use 4 as a border width guess and used 6 for seam allowances

(90 + 90 + 90 + 90 + 4 + 4 + 4 + 4 + 6) = 380

Divide 380 (approximate total length needed) by 36; approximate length of fabric available

380 / 36 = 10.55....

So - I would need to cut 11 strips - which would give me 396 inches of length

Then I would start multiplying various numbers by 11 to see what I come up with:

4 x 11 = 44 (too close for my comfort - let's try something narrower)
3-7/8 x 11 = 42-5/8 - I can deal with that
3-3/4 x 11 = 41-1/4

These numbers are theoretical -