Question on the niche grandpa shirt:
I am a 40R/50EU. I was thinking of going with L; would an XL make more sense given the summer vibe of the garment.
I am not sure what others do, but generally scotch-grain requires very little upkeep compared to regular calf.
I would of course from time to time apply shoe creme and use wax sparingly, because the wax tends to 'stick' a bit more to the scotch-grain.