Digital designer:
Smart trousers, smart shirt, smart shoes, casual jumper over the shirt. So they know you’re making an effort but you’re still resolutely dedicated to your personal brand of smart casual creative guy.
Realistically though no-one’s ever been turned down for a job for dressing well in the interview, but many have probably ballsed it by dressing like an idiot, so just play it safe and classy
or if you’ve got one of those mcgregor ‘fuck you’ pinstripe suits lying about go for that