Take as many days as are needed for students to work on, and complete their projects.
If students plans take only one day, encourage them to add more and think of something "out of the box" they could do to their project.
If you see students with over the top plans that seem like they will take WAY too long, try and refocus them to work on one piece that they are sure to finish.
The idea of these changes are to make their garment new to them, personalized, and possibly even functional in a new way. (added pockets? who knows?)
They are also attempting to make these into a piece of art in some way. A student that takes a long time to embroider one piece that will become a patch, but does an excellent job on it, has understood the goal.
There will be students that just want to do something quick, or not really interact with this. When that happens, encourage them to go home and look at pieces their parents or grandparents might have that they could imitate. Have them think of what they would do if they were to design their kuspuk for their first dance. Maybe they have already done their first dance and have fabric from their kuspuk used for that. They could make their hoodie match that in some way. Maybe there is something special to their family - an animal, a myth or story, a shape of hood - that they could ask about and then incorporate that as a way to honor where they come from.