Space Cat Shirt (5e Equipment)
From D&D Wiki
The Space Cat Shirt is a magic item.
If you wear this colorful magic item with a cat floating across it. Your charisma score will go up by 1 and your strength by two. It also has a spell on it, darkvision for 60ft. You can wear the shirt under or above your armor. And if you want to don and doff it you can unless it's under you armor.
the rest of this is up to your DM.