I do love that it seems like Tim still keeps his Mask state jacket in his bag.
To be honest if I was Tim I'd have the Mask too.
I mean, if I had someone to depend on like Jay and I knew my other personality might attack him I would want my friend to have a warning when I'm not myself.
And since I know my alter-ego likes to wear a mask more often than not it would provide a pretty good visual clue that something is wrong.