I think the kwik sew one, though, is only in the sewing for children book, that I can find (I have the book), though I don't think it's exactly like the hannah.
Here's a McCalls pattern that is similar (doesn't use buttons to open/close, but if you are a "sewer" you could make buttons instead). It's only for up to size four though.
This one
here says "night gown" but is sized for knits and is basically the Hannah pattern.
This one
here is almost the same style as a hannah (again without the buttons, *sigh*), probably the closest one I've found lately). It's out of print,though, so you have to buy sooner rather than later.
Hope some of those are helpful. I had one that I used for years for my dd...I think it was a McCalls,had the buttons and everything, but I don't see it any more...