What are the total number of hats/outfits that Mario can get in Super Mario Odyssey?
As of writing, including DLC, there are 49 hats and 50 outfits. However, data miners have confirmed several more outfits and hats to come, bringing the total to 54 hats and 54 outfits.
As of writing, the missing outfits are Harriet, Spewart, Zombie, and Santa, while the missing hats are the same four, plus 8-bit.
They keep adding more. I believe there are currently 48 hats and 49 outfits.