Here is McCall's pattern M5893. I started it at 2pm, straight from the envelope. It probably took me at least 20 minutes, if not 30, to cut out the pattern, get it pinned the right way on the fabric and get the fabric cut out. I imagine the "1 Hour" doesn't include that time. Once I had it cut out, the dress itself was pretty easy to make, but I'm saying this as someone who has made a few dresses. I made dress "C" technically, but I cut it to the length of dress "B." Even if I take out the time it took me to cut out the pattern and fabric, it still took me an hour and a half to make this, so it's a little closer to a "2 Hour" dress.
I used fabric I found at the thrift store. Maybe this fabric used to be cotton sheets? I really don't know. It looked brand new. This is a ridiculously comfortable dress with nice deep pockets perfect for hiding your hands. The downside is that it isn't exactly slimming with its billowing skirt and it has that faux maternity thing going on. I also think my fabric might be a little sheer in direct sunlight so I'll probably have to line it with something or wear a little slip under it. But seriously, if you know anything about sewing, this is a pretty cute and simple project