Why Ricky Gervais and Derek are Normcore but nice

Yes, Normcore. The 'theory' proposed by American trend forecasting collective K-Hole and picked up by New York Magazine as a fashion (or anti- fashion) movement that has become such a 'thing' that it's even been given a full page explanation in The Sun.

The idea is that rather than trying to be different with what you wear, you try to be 'ardently ordinary' or 'endearingly awkward', and, for a character rarely seen out of his zip-up polyester cardigan and sweat pants, it means Derek is not just riding a Normcore wave, he's the king of the movement.