If you are looking for bags that do not conflict with the retro looks of the bike, practical and to your liking, I'm right now convinced, after trying the Yamaha and sw-motels bags, that the best solution is to just get the Yamaha or sw-motech racks, the corresponding mounts from these guys https://www.gundgshop.de/english/mountings/
(there may be others) and attach them to whatever bags you want. It is an extremely easy job, that you can do yourself or have someone do it.
+ for the sw-motech rack: looks a bit better, easier installation, does not use the pillion pegs attachment, compatible with tail tidies, a little bit cheaper, sold by the unit.
- for the sw-motech: seems less sturdy (only two attachment points to the frame), bag attach/detach is fiddlier, no inbuilt lock (need to use a cable).
For the Yamaha:
+ instantaneous bag attach/detach, three attachment points to the frame, Less visible on the frame, in built key lock.
- needs pillion pegs to attach, requires mods to some tail tidies, a little more expensive, sold by the pair.