Crowley's Outfits/Looks in Season Two of Good Omens
From the Behind-the-Scenes Good Omens 2 videos:
Annie McEwan (Hair & Makeup Designer): David's so keen to be extraordinarily different in every single opportunity.
David Tennant: The look we have for him in the show is not quite as he's described in the book because the tv version of Good Omens is sort of set now rather than back when the book was written.
Crowley's sort of of-the-moment that he's in, unlike Aziraphale whose rather frozen in aspic and has worn the same clothes for hundreds of years. I think Crowley likes to sort of feel like he's of the moment that he's in so he has to be a little bit rock 'n' roll. I don't know how en vogue he really is.