I promised
noxcat a diagram of the cap I made the day before yesterday and here it is:

You could make it from less or more pieces, but I worked with the scraps that I had. The important thing is to make the opening large enough for both your head and pinned up braids to fit into it. The rest is styling.
ETA: Put it in the list for the Stash challenge on my web site and made a
page - just the same info, but easier to link to, since it's all in the same place.