I have used props for many years. Minis, maps and scenery, of📖 course. Wands and amulets. 'Magic' rings. Small, ornate bottles to represent potions. A 'toy' sword to draw when I enter melee. I've seen players wear elf ears and hats, but we don't really do cosplay at the table. Sometimes a T-shirt with an appropriate image adds to the flavor.