You can tell when a Hat is just a bit of practical cloathing or something being worn for the style and when it's being worn to cover up baldness.
I wear a flatcap most of the time, and I'm thinning on top and if I'm wearing my hat and someone fucks with it while it's on my head yea I'm going to get pissy with the person doing it, but I'd do the same if someone someone fucked with my jacket etc mostly because they are just fiucking with me, BUT I am ok being seen, having my photo taken and being with people without my hat.
Tim's never without his hat, ever.
Tim gives off the impression that he's someone who doesnt like the idea of getting old, and going balled is a very visible sign of that happening and when it happens when your young yea it sucks, you have three options Bic your head and own it, cut it short and ignore it, cover it up all the time and pretend like it's not happening.
Tim's chosen option 3, and that gives people a insight into his personality that most people have glossed over so far and that he's rather insecure about his appearance and it's more than just the hair, he just falls under the mark of the look he seems to idealise he's 5ft 10in so under the American / European average of 5ft 11in to 6ft 1in, his beard is patchy even as an adult, he's quite light in build, doesnt have the physique to fit a suit and is starting to get too old for the skater style.
I'd also take a punt on him not being secure in his own intellect but that's because of the way he tends to talk about things and people but that's more of a case of him trying to act as if he knows or think he knows more than he does or is willing to be open about.