Yeah, I feel like such a debbie downer still talking about the suit when so much about the trailer is promising, and Supes totally deserves any and all positivity right now.
But the film can still be great with a bad costume. It's like the design philosophy behind it was, how can the Guardians and Justice league International suits fit Superman's costume, rather than starting from scratch, and seeing what could be created for a Superman suit. The lines and padding are shared by all the costumed heroes and villains in the film.
The colours are perfect. And not just the colours; the colour blocking, with the red in the middle brought back by the trunks. Its those elements, plus how good David looks as Superman, that are doing all the heavy lifting, in my opinion.
But the film is still going to be the best written Superman for the big screen, so there's that.