He arrived at the party 'fashionably' late. [=he arrived at the party slightly late, which is the fashionable thing to do]
She wore a sleek black dress and 'fashionable' [='stylish'] shoes.
It isn't 'fashionable' to express such an opinion these days.
(..) and blow out of there. But what if it's a cruel prank? What if it's a cash bar? How dare they? All right, l'll go. But l'll be fashionably late. No. Yes. No. Yes. No! Yes! Definitely not! All right. l've made my decision! l'm going, and that's that. (..)2000 How the Grinch Stole Christmas
(..) - What's necessary, my friend. I will tell him you saved his life. Master Wayne, you've been gone a long time. - Yes, I have. - You look very fashionable. Apart from the mud. Are you coming back to Gotham for long, sir? As long as it takes. I want to show the people... (..)2005 Batman Begins
(..) we've negotiated! William Wallace. Can't be. Not tall enough. The Almighty says this must be a fashionable fight. It's drawn the finest people. Where is thy salute? For presenting yourselves on this battlefield, (..)1995 Braveheart