When has a Yonko ever looked good in the first place? The admirals usually dress up very well.
Kizaru even dresses up like a real mafia man at times.
Akainu? Well it´s a bit complicated. His style was insane pre time skip. The red suit is great
However I´ll be honest. Akainu looks like shit now, and looked like a school shooter with the hoodie in the Ohara flashback.
Kuzan? Was good pre TS, looks like shit now
Fujitora? slob.
Aramaki? I like the pants, but to enforce justice you need a suit.
When have the Yonko ever looked good?
Whitebeard: His style isn´t that good, though we can be fair and say not much would fit him. Is carried hard by the stache.
Shanks: Rich kid trying too hard to seem like one of the poors. Mogged hard by his brother
Big Mom: I liked the pirate hat in the God Valley flashback
Blackbeard: Looks like shit post ts
Buggy: Looks like shit post ts
Kaido: Had some style when he was younger but as an old man not really. Eastern dragons are cooler then western dragons though