So I've had some questions recently on how to make the monk clothing more historically accurate (or at least historically based), so here's some materials and reference that I've found useful.
The kasaya is the basic robe of the monk. It's three seperate pieces all overlapping each other (and the order they go in is very important). The color of the robes is also significant, either on a geographical or institutional level.
This one has a lot of similar stuff to the link above, but goes into a few more specifics. Particularly interesting is how monks change how they wear their robes if in the presence of a more senior monk. We'd have to discuss if in this case that would be Jampa (as Ten as the chosen one would have more power).
The link also mentions that the robe design needs to be cut into the design of the Magadha padi-fields, which looks like this:
Obviously that's more in-depth than you probably want, but it could give you some good ideas. If you're really crazy, here's a download with instructions and pictures on how to make your own monastic robes:
Don't take this totally as fact (I'm seeing conflicting sources), but at least in this one case, they placed these robes and hat on the newly found Dalai Lama as a means of showing how sacred he was. The yellow sash underneath the top red robe is important, but I haven't quite been able to find out why yet.
There are some pictures at the bottom of the PDF of children in the monasteries, but this one is more helpful for understanding what life is like for a kid in a monastery. Super long and educational-y, but kid if you find it worth the time.
Look at that face.