I mean, I welcome trying to get a Ben ghost to look great. He certainly should wear something befitting a redeemed Jedi, maybe something like he wore in the TLJ flashback. Luke and Leia seem happy, and he should seem happy, too.
I don’t really get why he wasn’t there in the movie, maybe just because they want to focus on the twins? But, like, why, though? It’s more about Rey and Ben than the two of them. I guess that’s just par for the course at that point.
JEDIT: I posted this before seeing Jonh’s post above. Nice, dude! It looks like his senior photo or something! And that’s not a bad thing!