All information is good. Sooner or later the answer will come.
I only do simple plastisol printing on a 6/6 press. I don't know much about any other type of garment printing other than it can be done direct to garment. The process is unknown to me.
More info. The flags will be exposed to weather as these ships are full functional radio controlled museum quality and are run in the wild. The wild being on lakes and in salt water bays and estuaries.
These boats are built to run at gatherings. The boats can be very large. Most are 1/32 or 1/24 scale. 8' to 12' long or more.

All sails are working and usually independent of each other. Most have working canons that fire blank charges in any order the operator chooses. They can have working anchors and winches.
This particular ship is near completion. It has had some time on the water to finalize ballasting. Fine details are still being done. It was started in 2006 I believe. All the trim work on the boat was hand made by carving sections, making molds for each part and casting multiple parts. Example. This man made all the windows by making full size wooden forms them casting the frames. Once the frames where made the window glass was made using white glue on a film of wax to make translucent sheets to mount in the frames. Then all is coated with a clear or tan varnish to make it water resistant.
The people who make these old ships have amazing talent far beyond what I do or even think of doing.