What is the best thing to use for the suit, or clothes you wear?
If you go back and look through Open Seasons again, you will find that every Mandalorian in the comic is shown with double sleeves, Montross happens to roll his up to let his forearms show. So in my humble opinion, I think you should have double sleeves.
I don't want to argue the point too much but I think you may be in error on this point.
Here are some direct scans that show that Jaster in Issue #2 doesn't have double sleeves.
Even Viszla doesn't have double sleeves in this issue: