The costume is good but I was never against the idea of the original film clown suit as oposed to the novel's silver one. I personally don't believe the suit makes the character, Tim Curry proved that.
I'm still not sold on it being modernised. Don't get me wrong, I love the 80s, was an 80s child and love the nostalgia that films and shows set in the 80s bring, but king grew up in the 50s, and his descriptions of that decade are so heartfelt you can almost see him fondly remembering his youth. For me, it's Stephen's vision of the 50s that is special, almost romantic. It's partly why 11/22/63 is my 2nd favourite, behind IT.
I read that Patrick Hockstetter has his fridge of animals and that he "shares some uncomfortable scenes with Bowers" so it's good that some of it will be closer to the film. One thing that really does concern me though is this:
This is from the director's instagram along with some others of Pennywise's victims like Betty Ripsom. I hope this is just promotional stuff or even fake. If Richie is not a full blown part of it then that is just too big a change.