1. Start by picking a cute fabric. I have made a couple of these out of curtain type fabric. I like the heaviness of it. It doesn't seem to slide around as easily, however it is hotter. What you see below is just a lightweight cotton. Make sure the fabric is not see-through since that kind of defeats the purpose of a nursing cover. Isn't this pattern cute? It's actually for little boys, so I won't be using this one, I'll be selling or gifting it!
3. After you've sewn the 2 short and 1 long side down, you'll work on your straps. I used some of the same fabric that I cut off the legnth in the beginning. I cut it about 20" long and 3-4 inches wide.
4. Take 1 strap and fold it so that the right sides are facing each other. Sew 1 end closed, the turn and sew down the legnth. Keep the other end open because you'll have to turn it inside out to see the pattern. Do this for both straps.
7. Begin hemming the top edge like you have the other three. Fold in 1/4" and then fold again 1/4" to conceal rough edges. When you get to the strap you will unpin it and stick the rough open edge under your hem. Then sew directly over it to hold it in place. Continue along with your hem until you get to the second strap and do the same thing. Some people like to add boning in between the straps to hold the cover open a bit. I personally don't like it, but if you want it, you just fold it into the seam making sure it is beding in the correct direction.