I first measure my fabric and cut it to the dimensions I want for my window.
And add 2"- 3" for your seam allowance, depending on how wide you want your hem.
Then I change my needle to a denim/heavy duty needle.
Because I chose to use two different textiles, my first step is to sew the two fabrics together:
Then I open this seam by ironing it (this way it lies flat when hung):
And because I can never cut a straight line, I even up my edges:
In all of the corners and places where my fabric overlaps, I always remove the bulk (that extra fabric that results from folding it together). This way I prevent my needle from breaking and I don't end up with bulges:
Then I iron my hem all of the around:
In each corner, same thing, remove the extra fabric:
Your corners should look like this:
Now I sew my outer hem, I pretend it's one big burp cloth (because I can sew a burp cloth). And notice that I tuck the raw edge under as I sew. Essentially, I am folding the hem in half:
My orange hem is wider (don't know how that happened), but same thing, I tuck the raw edge under and sew. A simple seam alllllll of the waaaaay around:
I use blackout lining with my curtains. (Our electric bill thanks me.) And you can see in this picture my hem isn't perfectly straight.
Like I said, for some reason I can't seem to cut a straight line.
***Please forgive the quality of my pictures lately, they're taken on my cell phone (some even with a cute baby slung around my hip).