AirTVfan
Thanks! biggrin
I found you some patterns which look like the dress... Actually it looks to me like a long t-shirt...
Anyway..
Simplicity - 3775
and then pattern A
Vogue - V8592
Burda - 3274
I think the one from Burda is most perfect for it! It's simple and has a zipper, since you have cotton, it's not a stretch-fabric, so I think that you should use something similar to the Burda pattern.
Yes, I've looked at your picture, browsed through a sewing pattern website and found you those patterns. ^_^
For the collar, I'm not sure what you can do, but I think you can make the shape of your shoulders in the pattern, a little wider, and longer at the neck... If I were you I'd make sure it can be opened and closed at the back. smile
And for getting the bottom of the dress more flowy: Make the dress wider at the bottom or use a flowy fabric. Otherwise you'll have to do with your fabric and your pattern and see how it turns out. I think it doesn't have to be all that flowy since your picture wasn't flowy either.
I don't know the difference between cotton and cotton blend, since it's not translated in my own language. <_>... But I'm guessing that cotton blend is a mixture with some other fabric other than cotton, or a different size of thread or something. I don't know... I don't think it matters what fabric you got. Cotton is probably fine. ^_^
I hope that helps! Good luck!