I've got a few t-shirts for this but they're all pretty similar. A white one with a dinosaur on it, a green Slytherin one, a grey Pink Floyd shirt, you get the picture. My jumpers are all pretty vague apart from the Hogwarts one. I've stopped wearing fair isle though because in the spring it gets a bit weird, however for the autumn and winter it's a go to staple.
I was doing a course called a BAFA for the last two weeks too, meaning I needed to wear shoes I could run in. And subsequently sprain my foot in. I can't wear a nice shirt with my beaten Converse. Aaaanyway.
The other thing I've found useful is a lightweight scarf, if I've not got a hood and it rains. But it's not as good as a hoodie.
So this is a basic throw together here. I really want to buy this shirt. New Look thought this through well.