6 30 it should say lining width face fabric width 6 inches instead of 3 inches.
Box pleat curtain tutorial.
3 5 3 5 4 11.
For my curtain i only wanted 1 pleat.
I altered her tutorial just a bit and made my own box pleat curtain.
She does a great job describing how to measure how much fabric you will need with the addition of the pleats hems etc.
Once you have cut your fabric lay the ride side of your drapery fabric down on top of your lining.
For the box pleat curtain example the window measured 50.
Get the fabric supplies you need at onlinefabricstore.
Pin your pleats so they measure 8 inches and top stitch 8 inches down on both sides of each pleat making sure to back tack at the bottom.
Return leading edge 4 for sewing the sides.
We factored in 8 per pleat an additional 3 on each side for the depth of the board to wrap around the return or the side of the board 1 2 for the 1 4 hem on each side and about a 1 2 for each end to wrap around the back of the board equaling 65 5 total in length.
We decided on 2 pleats so 3 sections of flat fabric.
My window is 46 wide.
So this is how i did my math.
Press all the pleats flat with an iron creating a 3 inch pleat so that the seam is behind the exact center of the pleat.
For each pleat you need to add 8 inches of fabric.