It was basically a rectangle of fabric folded in half, sewn together, with a hole for your neck. I've made a few of these the past few years, and now you can make one too! I recommend using a stretchy fabric, I made one that wasn't stretchy and I couldn't move-- I felt like I was in a straightjacket! The first one is a bit bigger, it's great for all of you who are average height. I'm only 5'2" so this one is a bit big on me.
It's similar to the one from here. Start with a rectangle of fabric about 68 inches by 28 inches and fold in half.
The second one is a bit smaller, and would certainly be too small for any considered tall at all.
You can find it here. Start with a rectangle of fabric about 59 inches by 22 inches and fold in half.
When I made one this past spring I went kind of in the middle of these two sizes and was happy with that.
Stretchy fabric is so hard to work with though, I hope it looks OK!