It was a bacterial infection, not a skin fungus.
Also Bailey was never bothered by the t-shirt, except for when he was on his bad catnip trip yesterday. In fact, when I put it back on him he started purring.

Oh goodness, I'm sorry I ruined the picture, I was just trying to protect my Russian kitten from the unwanted paparazzi! Thank goodness my foil didn't work, she looks quite adorable posing with her cat-son.

Missing.